Posts by Cassius

I hope some of the people who have been following the recent conversations on logic and reason will be able to listen and comment on this discussion. I think we have the foundation here for broad agreement on the role of the senses, but there is still much more to discuss in terms of fleshing out and --to use the term of the day - "describing" - the Epicurean method of thinking and decision-making.

We also need to deal in much greater detail with Charles's observation about Epicurus' views on "dogmatism." We have discussed that knowledge must be based on the senses (more accurately, the three legs of the Canon) but we have not really discussed what "knowledge" is.

This is probably a good time to review principal doctrine 24:

"24. If you reject any single sensation, and fail to distinguish between the conclusion of opinion, as to the appearance awaiting confirmation, and that which is actually given by the sensation or feeling, or each intuitive apprehension of the mind, you will confound all other sensations, as well, with the same groundless opinion, so that you will reject every standard of judgment. And if among the mental images created by your opinion you affirm both that which awaits confirmation, and that which does not, you will not escape error, since you will have preserved the whole cause of doubt in every judgment between what is right and what is wrong."

Also, from Diogenes Last time:

"Again, the fact of apperception confirms the truth of the sensations. And seeing and hearing are as much facts as feeling pain. From this it follows that as regards the imperceptible we must draw inferences from phenomena. For all thoughts have their origin in sensations by means of coincidence and analogy and similarity and combination, reasoning too contributing something.

....

Opinion they also call supposition, and say that it may be true or false: if it is confirmed or not contradicted, it is true ; if it is not confirmed or is contradicted, it is false. For this reason was introduced the notion of the problem awaiting confirmation: for example, waiting to come near the tower and see how it looks to the near view."

How does an Epicurean decide whether he "knows" something has been confirmed, or whether he should wait for more information? (Much the same question Martin raised in the podcast.)

Much more to come!

Welcome to Episode Fifty-Six of Lucretius Today.

I am your host Cassius, and together with my panelists from the EpicureanFriends.com forum, we'll walk you through the six books of Lucretius' poem, and discuss how Epicurean philosophy can apply to you today. We encourage you to study Epicurus for yourself, and we suggest the best place to start is the book, "Epicurus and His Philosophy" by Canadian professor Norman DeWitt.

For anyone who is not familiar with our podcast, please check back to Episode One for a discussion of our goals and our ground rules. If you have any question about that, please be sure to contact us at Epicureanfriends.com for more information.

Latin Lines 522 - 632

Munro Notes

522-548: the way in which the other senses are acted upon, may now be easily understood : sound is corporeal, since it is by striking on the ear that it excites sensation; often too the atoms of sound in passing through the narrow windpipe graze it and make it rough; again a long speech spoken in a loud voice takes much strength and substance from a man: smoothness of sound comes from smoothness of its atoms, roughness from roughness in them.

549-594: as the sounds are coming out, the tongue forms them into articulate words ; every one of which is distinctly heard near at hand; but at a greater distance the sound is indistinctly perceived, as it gets broken in passing through the air: again a single word often strikes the ears of a whole multitude; it must divide therefore into so many distinct words : often too voices are echoed distinctly back, sometimes six or seven in answer to one : these the wonder-loving multitude believes to be the voices and music of nymphs and woodland gods, Pan and the rest.

595-614: sounds will come through places, through which you cannot see, because their particles can pass by crooked ways, while images can only travel through straight passages: again one voice bursts into many similar voices, as a spark of fire into many sparks; so that all the corners of a building may be filled with sound; but even sound is deadened and broken in coming through such obstructions.

615-632: taste is quite as easy to explain ; the flavour is pressed out from food by chewing and passes into the pores of tongue and palate: the flavour is pleasant, if its atoms are smooth, but the contrary, if these are rough : when the food has got below the palate, the flavour is no longer perceived, and the food is then indifferent, if only it can be digested.

Brown 1743

And now, in what manner each of the other senses distinguishes its proper object is a subject of no great difficulty to explain. And first, sound and all voices are heard when they enter the ears, and strike with their bodies upon the sense; for we must allow that sound and voice are bodies, because they have power to make impression upon the sense; for the voice often scrapes the jaws, and the noise makes the windpipe rough as it passes through. When the seeds of words begin to hurry in a crowd through the narrow nerves, and to rush abroad, those vessels being full, the throat is raked and made hoarse, and the voice wounds the passage through which it goes into the air. There is no question then but voice and words consist of corporeal principles, because they affect and hurt the sense. You are likewise to observe how much a continual speaking, from morning to night, takes off from the body; how much it wears away from the very nerves and strength of the speaker, especially if it be delivered in the highest stretch of the voice. Of necessity therefore voice must be a body, because the speaker loses many parts from himself. The roughness then of the voice depends upon the roughness of the seeds, as the smoothness is produced from smooth seeds; nor are the seeds from the same figure that strike the ears when the trumpet sounds with grave and murmuring blasts, as when the sackbut rings with its hoarse noise, or swans in the cold vales of Helicon sing out with mournful notes their sweet complaint.

When therefore we press out this voice from the lungs, and send it abroad directly through the open mouth, the nimble tongue, with curious art, fashions it into words, and the motion of the lips assists likewise in the formation of them. And when the distance is not long from whence any voice proceeds, the words must of necessity be plainly heard and articulately distinguished, for in this case the voice preserves its proper frame and figure; but if the interjacent space be more than it should be, the words must needs be confused by reason of the length of air, and the voice be disordered as it passes through. Hence it is that you may hear a sound only, but discover nothing at all of the meaning of the words, the voice becomes so broken and obstructed. Besides, one sentence delivered from the mouth of a bawling cryer strikes the ears of all about him; for the one general voice, that is pronounced instantly, breaks instantly into innumerable little voices, and so reaches every particular ear, giving a proper form and a distinct sound to every word. But that part of the voice that does not reach the ear is diffused through the air to no purpose, but there dies; some parts strike upon solid places, and being reflected return a sound, and sometimes disappoint us with the echo or image of the word. If you well consider this, you will be able to account to yourself and others why, in solitary places, the rocks regularly return words the same with those we speak, while we seek our companions wandering over the dark mountains, or call after them aloud when they are dispersed and lose their way. I myself have seen places that return six words for one; the hills so reverberate the words from one another that they severally repeat them and send them back. The neighboring people fondly imagine such places to be frequented by goat-footed satyrs and nymphs, and tell stories of the fawns. They say that the dead silence of the night is disturbed by their late revels and wanton sports, that they hear the sound of music, and the soft notes of the harp, as the artist touches and sings to it together; that the swains all about can distinguish when Pan, shaking his garland of pine-leaves upon his head, with long-hung lip, runs over the hollow reeds, and so his pipe prolongs his rural song. They speak of many other strange sights, and monstrous fables of the same kind; lest, perhaps, they should be thought to dwell in places where the gods never come, and therefore they invent their wonderful tales like these; or they are induced by some reason or other, as mankind in general are mighty eager after prodigies.

In short, it is nothing strange that those places through which the eye can see nothing, that through such the voice can pass and strike the ears. We can converse together in different rooms, when the doors are shut, as we frequently do, because voice can pierce safely through the crooked pores of bodies, which images cannot, for they are broken if the passages are not straight; such are the pores of glass through which all sorts of images freely find way. Besides, the voice divides itself into several little voices, and these are broken again into others, as soon as the first single voice breaks into many more, like a spark of fire that leaps abroad into a thousand; so that all places about, even those behind you, are filled with voice, and are moved by the sound; but all images direct their course through straight passages as soon as they are thrown off from bodies, and therefore no one can see anything over his head; you hear words that are spoken without, yet even these, as they pass through the doors that are shut, grow weak, and strike the ear in a confused manner, so that we seem to hear a sound than to distinguish the words.

Nor is the account of the tongue and palate, by which we taste, a subject of greater nicety or more difficult to explain. And first, we perceive a taste in the mouth when we squeeze the juice from our food by chewing, as if we were to press a sponge full of water in our hands to make it dry; then the juice we draw out is spread over the pores of the palate, and through the crooked passages of the spongy tongue. When the seeds of this flowing juice are smooth, they gently touch, and affect all the moist and sweating surface of the tongue with sweet delight; but the seeds, the more rough and sharp they are, the more they stimulate and tear the sense. And then the pleasure of taste we feel no further than the palate; when the food is driven down through the jaws and divided among the limbs, the pleasure is gone; nor is it of any concern with what meat our bodies are nourished, if you can but digest what you eat, and separate it among the members, and preserve the moist tenor of the stomach.

Munro 1886

And now to explain in what way the other senses do each perceive their several objects, is the nowise arduous task which is still left. In the first place, all sound and voice is heard when they have made their way into the ears and have struck with their body the sense of hearing. For voice too and sound you must admit to be bodily, since they are able to act upon the senses. Again, voice often abrades the throat, and shouting in passing forth makes the windpipe more rough: when to wit the first-beginnings of voices have risen up in larger mass and commenced to pass abroad through their strait passage, you are to know the door of the mouth now crammed itself is abraded. There is no doubt then that voices and words consist of bodily first beginnings, with the power to hurt; nor can you fail to know how much of body is taken away and how much is withdrawn from men’s very sinews and strength by a speech continued without interruption from the dawning brightness of morning to the shadow of black night, above all if it has been poured forth with much loud shouting. Voice therefore must be bodily, since a man by much speaking loses a portion from his body. Next roughness of voice comes from roughness of first-beginnings, as smoothness is produced from smoothness. Nor are the first-beginnings of like shape which pierce the ears in these two cases: when the trumpet brays dully in deep low tones, the barbarian country roused echoing back the hoarse hollow sound, and when swans from the headstrong torrents of Helicon raise their clear-toned dirge with plaintive voice.

When therefore we force these voices forth from the depths of our body and discharge them straight out at the mouth, the pliant tongue, deft fashioner of words, gives them articulate utterance and the structure of the lips does its part in shaping them. Therefore when the distance is not long between the point from which each several voice has started and that at which it arrives, the very words too must be plainly heard and distinguished syllable by syllable; for each voice retains its structure and retains its shape. But if the space between be more than is suitable, the words must be huddled together in passing through much air and the voice be disorganized in its flight through the same. Therefore it is that you can hear a sound, yet cannot distinguish what the meaning of the words is: so huddled and hampered is the voice when it comes. Again a single word often stirs the ears of a whole assembly of people, when uttered by the crier’s mouth. One voice therefore in a moment starts asunder into many voices, since it distributes itself separately into all the ears, stamping upon them the form and distinct sound of the word. But such of the voices as do not fall directly on the ears, are carried past and lost, fruitlessly dispersed in air: some striking upon solid spots are thrown back and give back a sound and sometimes mock by an echo of the word. When you fully perceive all this, you may explain to yourself and others how it is that in lonely spots rocks give back in regular succession forms of words like to those sent forth, as we seek our comrades straying about among the darkened hills and with loud voice call upon them scattered abroad. I have seen places give back as many as six or seven voices, when you sent forth one: in such wise did the very hills dash back on hills and repeat the words thus trained to come back. These spots the people round fancy that the goat-footed satyrs and nymphs inhabit, and tell that they are the fauns by whose night-pervading noise and sportive play as they declare the still silence is broken and sounds produced of stringed instruments and sweet plaintive melodies, such as the pipe pours forth when beaten by the fingers of the players; the country-people hearing far and wide, what time Pan nodding the piny covering of his head half a beast’s oft runs over the gaping reeds with curved lip, making the pipe without ceasing to pour forth its woodland song. Other such like prodigies and marvels they tell of, that they may not haply bethought to inhabit lonely places, abandoned even by the gods. On this account they vaunt such wonders in their stories or are led on by some other reason; inasmuch as the whole race of man is all too greedy after listening ears.

To proceed, you need not wonder how it is that through places, through which the eyes cannot see plain things, voices come and strike the ears. We often see a conversation go on even through closed doors, sure enough because the voice can pass uninjured through the winding openings of things, while idols refuse to pass: they are torn to shreds, if the openings through which they glide are not straight, like those of glass, through which every image passes. Again, a voice distributes itself in all directions, since voices are begotten one out of another, when a single voice has once gone forth and sprung into many, as a spark of fire is often wont to distribute itself into its constituent fires. Therefore places are filled with voices which though far withdrawn out of view yet are all in commotion and stirred by sound. But idols all proceed in straight courses as soon as they have been discharged; and therefore you can never see beyond a wall, but you may hear voices outside it. And yet this very voice even in passing through the walls of houses is blunted and enters the ears in a huddled state, and we seem to hear the sound rather than the actual words.

The tongue and palate whereby we perceive flavor, have not in them anything that calls for longer explanation or offers more difficulty. In the first place we perceive flavor in the mouth when we press it out in chewing our food, in the same way as when one haply begins to squeeze with his hand and dry a sponge full of water. Next the whole of what we press out distributes itself through the cavities of the palate and the intricate openings of the porous tongue. Therefore when the bodies of oozing flavor are smooth, they pleasantly touch and pleasantly feel all the parts if about the moist exuding quarters of the palate. But on the other hand, when they rise in a mass they puncture and tear the sense according to the degree in which they are pervaded by roughness. Next the pleasure from the flavor reaches as far as the palate; when however it has passed down through the throat, there is no pleasure while it is all distributing itself into the frame. And it makes no matter what the food is with which the body is nurtured, provided you can digest what you take and transmit it into the frame and keep the stomach in an equable condition of moistness.

Bailey 1921

Now it is left to explain in what manner the other senses perceive each their own object—a path by no means stony to tread. First of all, every kind of sound and voice is heard, when they have found their way into the ears and struck upon the sense with their body. For that voice too and sound are bodily you must grant, since they can strike on the senses. Moreover, the voice often scrapes the throat and shouting makes the windpipe over-rough as it issues forth; since, indeed, the first-beginnings of voices have risen up in greater throng through the narrow passage, and begun to pass forth: and then, in truth, when the passages are crammed, the door too is scraped. There is no doubt then that voices and words are composed of bodily elements, so that they can hurt. And likewise it does not escape you how much body is taken away and drawn off from men’s very sinews and strength by speech continued without pause from the glimmer of rising dawn to the shades of dark night, above all if it is poured out with loud shouting. And so the voice must needs be of bodily form, since one who speaks much loses a part from his body. Now roughness of voice comes from roughness in its first-beginnings, and likewise smoothness is begotten of their smoothness. Nor do the first-beginnings pierce the ears with like form, when the trumpet bellows deep with muffled tones, and when the barbarous Berecyntian pipe shrieks with shrill buzzing sound, and when the swans at night from the cold marches of Helicon lift with mournful voice their clear lament.

These voices then, when we force them forth from deep within our body, and shoot them abroad straight through our mouth, the pliant tongue, artificer of words, severs apart, and the shaping of the lips in its turn gives them form. Therefore, when it is no long distance from which each single utterance starts and reaches to us, it must needs be that the very words too are clearly heard and distinguished sound by sound. For each utterance preserves its shaping and preserves its form. But if the space set between be over great, passing through much air the words must needs be jostled together, and the utterance disordered, while it flies across the breezes. And so it comes to pass that you can perceive the sound, yet not distinguish what is the meaning of the words: so confounded and entangled does the utterance come to you. Again one single word often awakes the ears of all in an assembly, shot out from the crier’s mouth. Therefore one voice flies apart immediately into many voices, since it sunders itself into all the several ears, imprinting on the words a shape and a clear-cut sound. But that part of the voices which falls not straight upon the ears, passes by and perishes scattered in vain through the air. Some beating upon solid spots are cast back, and give back the sound, and at times mock us with the echo of a word. And when you see this clearly, you could give account to yourself and others, in what manner among solitary places rocks give back the counterparts of words each in due order, when we seek our comrades wandering amid the dark hills, and with loud voice summon them scattered here and there. I have seen places give back even six or seven cries, when you sent forth but one: so surely did one hill beat back to another and repeat the words trained to come back again. Such places the dwellers around fancy to be the haunt of goat-footed satyrs and nymphs, and they say that there are fauns, by whose clamour spreading through the night and sportive revels they declare that the dumb silence is often broken; and that sounds of strings are awakened, and sweet sad melodies, which the pipe pours forth, stopped by the fingers of players; and that the race of country folk hears far and wide, when Pan, tossing the piny covering of his half-monstrous head, ofttimes with curling lip runs over the open reeds, so that the pipe ceases not to pour forth woodland music. All other marvels and prodigies of this kind they tell, lest by chance they be thought to live in lonely places, deserted even of the gods. Therefore they boast such wonders in discourse, or else are led on in some other way, even as the whole race of man is over greedy of prattling tales.

For the rest, we need not wonder by what means voices come and arouse the ears through places, though which the eyes cannot see things clear to view. Often too we see a talk carried on through closed doors, because, we may be sure, voice can pass unharmed through winding pores in things, but idols refuse to pass. For they are torn asunder, unless they stream through straight pores, as are those in glass, through which every image can fly. Moreover, a voice is severed in every direction, since voices are begotten one from another, when once one voice has issued forth and sprung apart into many, even as a spark of fire is often wont to scatter itself into its several fires. And so places hidden far from sight are filled with voices; they are in a ferment all around, alive with sound. But all idols press on in the direct line, as they have once been started; wherefore no one can see beyond the wall, but can perceive voices outside. And yet even this voice, while it passes through the walls of the house, is dulled, and enters the ear all confounded, and we seem to hear a sound rather than words.

Nor do the tongue and palate, whereby we perceive taste, need longer account or give more trouble. First of all we perceive taste in our mouth, when we press it out in chewing our food, just as if one by chance begins to squeeze with the hand and dry a sponge full of water. Then what we press out is all spread abroad through the pores of the palate, and through the winding passages of the loose-meshed tongue. Therefore, when the bodies of the oozing savour are smooth, they touch pleasantly, and pleasantly stroke all around the moist sweating vault above the tongue. But, on the other hand, the more each several thing is filled with roughness, the more does it prick the sense and tear it in its onslaught. Next pleasure comes from the savour within the limit of the palate; but when it has passed headlong down through the jaws, there is no pleasure while it is all being spread abroad into the limbs. Nor does it matter a whit with what diet the body is nourished, provided only you can digest what you take, and spread it abroad in the limbs, and keep an even moistness in the stomach.

Episode Fifty-Five of the Lucretius Today Podcast is now available. In today's podcast we will continue to discuss how Reason is Dependent on the Senses, and Elayne will take Cicero's Torquatus to task for his position on how best to explain that pleasure is the ultimate good. As always, let us know your questions and comments in the thread below.

The forum software has lots of features but it can definitely be confusing. If you run into anything that stumps you, just ask. Glad to have you!

No real need to use the code box, as far as I can tell, but welcome, and we look forward to hearing more from you!

Hello and welcome to the forum FCenRed !

This is the place for students of Epicurus to coordinate their studies and work together to promote the philosophy of Epicurus. Please remember that all posting here is subject to our Community Standards / Rules of the Forum our Not Neo-Epicurean, But Epicurean and our Posting Policy statements and associated posts.

Please understand that the leaders of this forum are well aware that many fans of Epicurus may have sincerely-held views of what Epicurus taught that are incompatible with the purposes and standards of this forum. This forum is dedicated exclusively to the study and support of people who are committed to classical Epicurean views. As a result, this forum is not for people who seek to mix and match some Epicurean views with positions that are inherently inconsistent with the core teachings of Epicurus.

All of us who are here have arrived at our respect for Epicurus after long journeys through other philosophies, and we do not demand of others what we were not able to do ourselves. Epicurean philosophy is very different from other viewpoints, and it takes time to understand how deep those differences really are. That's why we have membership levels here at the forum which allow for new participants to discuss and develop their own learning, but it's also why we have standards that will lead in some cases to arguments being limited, and even participants being removed, when the purposes of the community require it. Epicurean philosophy is not inherently democratic, or committed to unlimited free speech, or devoted to any other form of organization other than the pursuit by our community of happy living through the principles of Epicurean philosophy.

One way you can be most assured of your time here being productive is to tell us a little about yourself and personal your background in reading Epicurean texts. It would also be helpful if you could tell us how you found this forum, and any particular areas of interest that you have which would help us make sure that your questions and thoughts are addressed.

In that regard we have found over the years that there are a number of key texts and references which most all serious students of Epicurus will want to read and evaluate for themselves. Those include the following.

1. "Epicurus and His Philosophy" by Norman DeWitt
2. "A Few Days In Athens" by Frances Wright
3. The Biography of Epicurus by Diogenes Laertius. This includes the surviving letters of Epicurus, including those to Herodotus, Pythocles, and Menoeceus.
4. "On The Nature of Things" - by Lucretius (a poetic abridgement of Epicurus' "On Nature"
5. "Epicurus on Pleasure" - By Boris Nikolsky
6. The chapters on Epicurus in Gosling and Taylor's "The Greeks On Pleasure."
7. Cicero's "On Ends" - Torquatus Section
8. Cicero's "On The Nature of the Gods" - Velleius Section
9. The Inscription of Diogenes of Oinoanda - Martin Ferguson Smith translation
10. A Few Days In Athens" - Frances Wright
11. Lucian Core Texts on Epicurus: (1) Alexander the Oracle-Monger, (2) Hermotimus
12. Philodemus "On Methods of Inference" (De Lacy version, including his appendix on relationship of Epicurean canon to Aristotle and other Greeks)

It is by no means essential or required that you have read these texts before participating in the forum, but your understanding of Epicurus will be much enhanced the more of these you have read.

And time has also indicated to us that if you can find the time to read one book which will best explain classical Epicurean philosophy, as opposed to most modern "eclectic" interpretations of Epicurus, that book is Norman DeWitt's Epicurus And His Philosophy.

Welcome to the forum!

In addition to what Charles said, I think everyone will be happy to hear that our recording of Episode 55 is now complete and is probably one of our most helpful and friendliest conversations that will be very helpful in moving forward toward further precision on some of our recent conversations. I'll get it edited and uploaded asap!

Great post Don.

I think you can add to the list that if I recall correctly, when Lucretius introduces the subject in book one, he adds the proviso that nothing comes from nothing "...at the will of the gods" or something to that effect.

As to the twelve fundamental propositions, yes I have seen commentators with other versions of the list, but they are all assembling them from Lucretius and the letter to Herodotus. The main one that comes to mind was done by Diskin Clay, and one aspect of that one that always stuck with me is that he included the equivalent of PD1, that the gods are complete in themselves, as one of the twelve fundamental propositions.

I believe he includes it in his article, "Epicurus' Last Will and Testamant." I don't remember the date but shortly after I first started studying Epicurus, probably in 2013. I contacted Mr. Clay when he was living in North Carolina (he's now deceased) and he sent me a printed copy. I will upload it and come back here and link it. I haven't read it in years but I am sure you will find it interesting.

Here's the article: "Epicurus' Last Will and Testament" - by Diskin Clay

In case anyone is interested in a Diskin Clay reading marathon, here is:

- his 1967 thesis from the University of Washington: Lucretius' Translation of Greek Philosophy - By Diskin Clay

- his article A Lost Epicurean Community - By Diskin Clay

One more: Diskin Clay - A Brief Memoir for Angelo Casanova (regarding Oinoanda)

Below is a photo of Mr. Clay in his younger years.

Welcome to Episode Fifty-Five of Lucretius Today. Last week we started this passage from Book 4, and today we will finish it, focusing on the last two passages underlined below.

I am your host Cassius, and together with my panelists from the EpicureanFriends.com forum, we'll walk you through the six books of Lucretius' poem, and discuss how Epicurean philosophy can apply to you today. We encourage you to study Epicurus for yourself, and we suggest the best place to start is the book, "Epicurus and His Philosophy" by Canadian professor Norman DeWitt.

For anyone who is not familiar with our podcast, please check back to Episode One for a discussion of our goals and our ground rules. If you have any question about that, please be sure to contact us at Epicureanfriends.com for more information.

In today's podcast we will discuss how reason is dependent upon the senses.

Latin Lines 469 -521

Munro Notes

469-521 if a man teaches that nothing can be known, how does be know that? how distinguish between knowing and not knowing? on the truth of the senses all reasoning depends, which must be false if they are false: nor is one sense more certain than another; all being equally true; nor is the same sense at one time more certain than at another: all reasoning, nay life itself would at once come to an end, if the senses are not to be trusted; as in any building, if the rule and square are wry, every part will be crooked and unstable, so all reasoning must be false, if the senses on which it is grounded are false.

Brown 1743

Lastly, if anyone thinks that he knows nothing, he cannot be sure that he knows this, when he confesses that he knows nothing at all. I shall avoid disputing with such a trifler, who perverts all things, and like a tumbler with his head prone to the earth, can go no otherwise than backwards. And yet allow that he knows this, I would ask (since he had nothing before to lead him into such a knowledge) whence he had the notion what it was to know, or not to know; what it was that gave him an idea of Truth or Falsehood, and what taught him to distinguish between doubt and certainty?

But you will find that knowledge of truth is originally derived from the senses, nor can the senses be contradicted, for whatever is able by the evidence of an opposite truth to convince the senses of falsehood, must be something of greater certainty than they. But what can deserve greater credit than the senses require from us? Will reason, derived from erring sense, claim the privilege to contradict it? Reason - that depends wholly upon the senses,which unless you allow to be true, all reason must be false. Can the ears correct the eyes? Or the touch the ears? Or will taste confute the touch? Or shall the nose or eyes convince the rest? This, I think, cannot be, for every sense has a separate faculty of its own, each has its distinct powers; and therefore an object, soft or hard, hot or cold, must necessarily be distinguished as soft or hard, hot or cold, by one sense separately, that is, the touch. It is the sole province of another, the sight, to perceive the colors of things, and the several properties that belong to them. The taste has a distinct office. Odors particularly affect the smell, and sound the ears. And therefore it cannot be that one sense should correct another, nor can the same sense correct itself, since an equal credit ought to be given to each; and therefore whatever the senses at any time discover to us must be certain.

And though reason is not able to assign a cause why an object that is really four-square when near, should appear round when seen at a distance; yet, if we cannot explain this difficulty, it is better to give any solution, even a false one, than to deliver up all Certainty out of our power, to break in upon our first principle of belief, and tear up all foundations upon which our life and security depend. For not only all reason must be overthrown, but life itself must be immediately extinguished, unless you give credit to your senses. These direct you to fly from a precipice and other evils of this sort which are to be avoided, and to pursue what tends to your security. All therefore is nothing more than an empty parade of words that can be offered against the certainty of sense.

Lastly, as in a building, if the principle rule of the artificer be not true, if his line be not exact, or his level bear in to the least to either side, every thing must needs be wrong and crooked, the whole fabric must be ill-shaped, declining, hanging over, leaning and irregular, so that some parts will seem ready to fall and tumble down, because the whole was at first disordered by false principles. So the reason of things must of necessity be wrong and false which is founded upon a false representation of the senses.

Munro 1886

Again if a man believe that nothing is known, he knows not whether this even can be known, since he admits he knows nothing. I will therefore decline to argue the case against him who places himself with head where his feet should be. And yet granting that he knows this, I would still put this question, since he has never yet seen any truth in things, whence he knows what knowing and not knowing severally are, and what it is that has produced the knowledge of the true and the false and what has proved the doubtful to differ from the certain.

You will find that from the senses first has proceeded the knowledge of the true and the false and that the senses cannot be refuted. For that which is of itself to be able to refute things false by true things must from the nature of the case be proved to have the higher certainty. Well then, what must fairly be accounted of higher certainty than sense? Shall reason founded on false sense be able to contradict them, wholly founded as it is on the senses? And if they are not true, then all reason as well is rendered false. Or shall the ears be able to take the eyes to task, or the touch the ears? Again shall the taste call in question this touch, or the nostrils refute or the eyes controvert it? Not so, I guess; for each apart has its own distinct office, each its own power; and therefore we must perceive what is soft and cold or hot by one distinct faculty, by another perceive the different colors of things and thus see all objects which are conjoined with color. Taste too has its faculty apart; smells spring from one source, sounds from another. It must follow therefore that any one sense cannot confute any other. No nor can any sense take itself to task, since equal credit must be assigned to it at all times. What therefore has at any time appeared true to each sense, is true.

And if reason shall be unable to explain away the cause why things which close at hand were square, at a distance looked round, it yet is better, if you are at a loss for the reason, to state erroneously the causes of each shape than to let slip from your grasp on any side things manifest and ruin the groundwork of belief and wrench up all the foundations on which rest life and existence. For not only would all reason give way, life itself would at once fall to the ground, unless you choose to trust the senses and shun precipices and all things else of this sort that are to be avoided, and to pursue the opposite things. All that host of words then be sure is quite unmeaning which has been drawn out in array against the senses.

Once more, as in a building, if the rule first applied is wry, and the square is untrue and swerves from its straight lines, and if there is the slightest hitch in any part of the level, all the construction must be faulty, all must be wry, crooked, sloping, leaning forwards, leaning backwards, without symmetry, so that some parts seem ready to fall, others do fall, ruined all by the first erroneous measurements; so too all reason of things must needs prove to you distorted and false, which is founded on false senses.

Bailey 1921

Again, if any one thinks that nothing is known, he knows not whether that can be known either, since he admits that he knows nothing. Against him then I will refrain from joining issue, who plants himself with his head in the place of his feet. And yet were I to grant that he knows this too, yet I would ask this one question; since he has never before seen any truth in things, whence does he know what is knowing, and not knowing each in turn, what thing has begotten the concept of the true and the false, what thing has proved that the doubtful differs from the certain?

You will find that the concept of the true is begotten first from the senses, and that the senses cannot be gainsaid. For something must be found with a greater surety, which can of its own authority refute the false by the true. Next then, what must be held to be of greater surety than sense? Will reason, sprung from false sensation, avail to speak against the senses, when it is wholly sprung from the senses? For unless they are true, all reason too becomes false. Or will the ears be able to pass judgement on the eyes, or touch on the ears? or again will the taste in the mouth refute this touch; will the nostrils disprove it, or the eyes show it false? It is not so, I trow. For each sense has its faculty set apart, each its own power, and so it must needs be that we perceive in one way what is soft or cold or hot, and in another the diverse colours of things, and see all that goes along with colour. Likewise, the taste of the mouth has its power apart; in one way smells arise, in another sounds. And so it must needs be that one sense cannot prove another false. Nor again will they be able to pass judgement on themselves, since equal trust must at all times be placed in them. Therefore, whatever they have perceived on each occasion, is true.

And if reason is unable to unravel the cause, why those things which close at hand were square, are seen round from a distance, still it is better through lack of reasoning to be at fault in accounting for the causes of either shape, rather than to let things clear seen slip abroad from your grasp, and to assail the grounds of belief, and to pluck up the whole foundations on which life and existence rest. For not only would all reasoning fall away; life itself too would collapse straightway, unless you chose to trust the senses, and avoid headlong spots and all other things of this kind which must be shunned, and to make for what is opposite to these. Know, then, that all this is but an empty store of words, which has been drawn up and arrayed against the senses.

Again, just as in a building, if the first ruler is awry, and if the square is wrong and out of the straight lines, if the level sags a whit in any place, it must needs be that the whole structure will be made faulty and crooked, all awry, bulging, leaning forwards or backwards, and out of harmony, so that some parts seem already to long to fall, or do fall, all betrayed by the first wrong measurements; even so then your reasoning of things must be awry and false, which all springs from false senses.

Images are significant in Epicurean philosophy for the light they shed on Epicurus' theory of how we receive information about the outside world. There is a long discussion in Book 4 of Lucretius on this topic. Although our understanding of light and hearing and other sensations is much different today, the discussion of images shows that Epicurus understood the nature of illusions and other distortions in the information we perceive about the outside world, and therefore the necessity of adjusting for those distortions.

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Lucretius Book Two:

[216] Herein I would fain that you should learn this too, that when first-bodies are being carried downwards straight through the void by their own weight, at times quite undetermined and at undetermined spots they push a little from their path: yet only just so much as you could call a change of trend. But if they were not used to swerve, all things would fall downwards through the deep void like drops of rain, nor could collision come to be, nor a blow brought to pass for the first-beginnings: so nature would never have brought aught to being.

[225] But if perchance any one believes that heavier bodies, because they are carried more quickly straight through the void, can fall from above on the lighter, and so bring about the blows which can give creative motions, he wanders far away from true reason.

For all things that fall through the water and thin air, these things must needs quicken their fall in proportion to their weights, just because the body of water and the thin nature of air cannot check each thing equally, but give place more quickly when overcome by heavier bodies. But, on the other hand, the empty void cannot on any side, at any time, support anything, but rather, as its own nature desires, it continues to give place; wherefore all things must needs be borne on through the calm void, moving at equal rate with unequal weights. The heavier will not then ever be able to fall on the lighter from above, nor of themselves bring about the blows, which make diverse the movements, by which nature carries things on. Wherefore, again and again, it must needs be that the first-bodies swerve a little; yet not more than the very least, lest we seem to be imagining a sideways movement, and the truth refute it. For this we see plain and evident, that bodies, as far as in them lies, cannot travel sideways, since they fall headlong from above, as far as you can descry. But that nothing at all swerves from the straight direction of its path, what sense is there which can descry?

[251] Once again, if every motion is always linked on, and the new always arises from the old in order determined, nor by swerving do the first-beginnings make a certain start of movement to break through the decrees of fate, so that cause may not follow cause from infinite time; whence comes this free will for living things all over the earth, whence, I ask, is it wrested from fate, this will whereby we move forward, where pleasure leads each one of us, and swerve likewise in our motions neither at determined times nor in a determined direction of place, but just where our mind has carried us? For without doubt it is his own will which gives to each one a start for this movement, and from the will the motions pass flooding through the limbs.

[B-2::263] Do you not see too how, when the barriers are flung open, yet for an instant of time the eager might of the horses cannot burst out so suddenly as their mind itself desires? For the whole store of matter throughout the whole body must be roused to movement, that then aroused through every limb it may strain and follow the eager longing of the mind; so that you see a start of movement is brought to pass from the heart, and comes forth first of all from the will of the mind, and then afterwards is spread through all the body and limbs.

[272] Nor is it the same as when we move forward impelled by a blow from the strong might and strong constraint of another. For then it is clear to see that all the matter of the body moves and is hurried on against our will, until the will has reined it back throughout the limbs. Do you not then now see that, albeit a force outside pushes many men and constrains them often to go forward against their will and to be hurried away headlong, yet there is something in our breast, which can fight against it and withstand it? And at its bidding too the store of matter is constrained now and then to turn throughout the limbs and members, and, when pushed forward, is reined back and comes to rest again.

[284] Wherefore in the seeds too you must needs allow likewise that there is another cause of motion besides blows and weights, whence comes this power born in us, since we see that nothing can come to pass from nothing. For weight prevents all things coming to pass by blows, as by some force without. But that the very mind feels not some necessity within in doing all things, and is not constrained like a conquered thing to bear and suffer, this is brought about by the tiny swerve of the first-beginnings in no determined direction of place and at no determined time.

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Lucretius Book One:

[511] Moreover, since there is void in things created, solid matter must needs stand all round, nor can anything by true reasoning be shown to hide void in its body and hold it within, except you grant that what keeps it in is solid. Now it can be nothing but a union of matter, which could keep in the void in things. Matter then, which exists with solid body, can be everlasting, when all else is dissolved.

[520] Next, if there were nothing which was empty and void, the whole would be solid; unless on the other hand there were bodies determined, to fill all the places that they held, the whole universe would be but empty void space. Body, then, we may be sure, is marked off from void turn and turn about, since there is neither a world utterly full nor yet quite empty. There are therefore bodies determined, such as can mark off void space from what is full. These cannot be broken up when hit by blows from without, nor again can they be pierced to the heart and undone, nor by any other way can they be assailed and made to totter; all of which I have above shown to you but a little while before. For it is clear that nothing could be crushed in without void, or broken or cleft in twain by cutting, nor admit moisture nor likewise spreading cold or piercing flame, whereby all things are brought to their end. And the more each thing keeps void within it, the more is it assailed to the heart by these things and begins to totter. Therefore, if the first bodies are solid and free from void, as I have shown, they must be everlasting.

[540] Moreover, if matter had not been everlasting, ere this all things had wholly passed away to nothing, and all that we see had been born again from nothing. But since I have shown above that nothing can be created from nothing, nor can what has been begotten be summoned back to nothing, the first-beginnings must needs be of immortal body, into which at their last day all things can be dissolved, that there may be matter enough for renewing things. Therefore the first-beginnings are of solid singleness, nor in any other way can they be preserved through the ages from infinite time now gone and renew things.

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