1. Home
    1. Start Here: Study Guide
    2. Community Standards And Posting Policies
    3. Terms of Use
    4. Moderator Team
    5. Site Map
    6. Quizzes
    7. Articles
      1. Featured Articles
    8. All Blog Posts
      1. Elli's Blog / Articles
  2. Wiki
    1. Wiki Home
    2. FAQ
    3. Classical Epicureanism
    4. Physics Wiki
    5. Canonics Wiki
    6. Ethics Wiki
    7. Search Assistance
    8. Not NeoEpicurean
    9. Foundations
    10. Navigation Outlines
    11. Key Pages
  3. Forum
    1. Full Forum List
    2. Welcome Threads
    3. Physics
    4. Canonics
    5. Ethics
    6. Uncategorized Forum
    7. Study Resources Forum
    8. Ancient Texts Forum
    9. Shortcuts
    10. Featured
    11. Most Discussed
  4. Latest
    1. New Activity
    2. Latest Threads
    3. Dashboard
    4. Search By Tag
    5. Complete Tag List
  5. Podcast
    1. Lucretius Today Podcast
    2. Episode Guide
    3. Lucretius Today At Youtube
    4. EpicureanFriends Youtube Page
  6. Texts
    1. Overview
    2. Diogenes Laertius
    3. Principal Doctrines
    4. Vatican Sayings
    5. Lucretius
    6. Herodotus
    7. Pythocles
    8. Menoeceus
    9. Fragments - Usener Collection
    10. Torquatus On Ethics
    11. Velleius On Gods
    12. Greek/Latin Help
  7. Gallery
    1. Featured images
    2. Albums
    3. Latest Images
    4. Latest Comments
  8. Calendar
    1. Upcoming Events List
    2. Zoom Meetings
    3. This Month
    4. Sunday Zoom Meetings
    5. First Monday Zoom Meetings
    6. Wednesday Zoom Meeting
    7. Twentieth Zoom Meetings
    8. Zoom Meetings
  9. Other
    1. Featured Content
    2. Blog Posts
    3. Files
    4. Logbook
    5. EF ToDo List
    6. Link-Database
  • Login
  • Register
  • Search
Everywhere
  • Everywhere
  • Forum
  • Articles
  • Blog Articles
  • Files
  • Gallery
  • Events
  • Pages
  • Wiki
  • Help
  • FAQ
  • More Options

Welcome To EpicureanFriends.com!

"Remember that you are mortal, and you have a limited time to live, and in devoting yourself to discussion of the nature of time and eternity you have seen things that have been, are now, and are to come."

Sign In Now
or
Register a new account
  1. Home
    1. Start Here: Study Guide
    2. Community Standards And Posting Policies
    3. Terms of Use
    4. Moderator Team
    5. Site Map
    6. Quizzes
    7. Articles
      1. Featured Articles
    8. All Blog Posts
      1. Elli's Blog / Articles
  2. Wiki
    1. Wiki Home
    2. FAQ
    3. Classical Epicureanism
    4. Physics Wiki
    5. Canonics Wiki
    6. Ethics Wiki
    7. Search Assistance
    8. Not NeoEpicurean
    9. Foundations
    10. Navigation Outlines
    11. Key Pages
  3. Forum
    1. Full Forum List
    2. Welcome Threads
    3. Physics
    4. Canonics
    5. Ethics
    6. Uncategorized Forum
    7. Study Resources Forum
    8. Ancient Texts Forum
    9. Shortcuts
    10. Featured
    11. Most Discussed
  4. Latest
    1. New Activity
    2. Latest Threads
    3. Dashboard
    4. Search By Tag
    5. Complete Tag List
  5. Podcast
    1. Lucretius Today Podcast
    2. Episode Guide
    3. Lucretius Today At Youtube
    4. EpicureanFriends Youtube Page
  6. Texts
    1. Overview
    2. Diogenes Laertius
    3. Principal Doctrines
    4. Vatican Sayings
    5. Lucretius
    6. Herodotus
    7. Pythocles
    8. Menoeceus
    9. Fragments - Usener Collection
    10. Torquatus On Ethics
    11. Velleius On Gods
    12. Greek/Latin Help
  7. Gallery
    1. Featured images
    2. Albums
    3. Latest Images
    4. Latest Comments
  8. Calendar
    1. Upcoming Events List
    2. Zoom Meetings
    3. This Month
    4. Sunday Zoom Meetings
    5. First Monday Zoom Meetings
    6. Wednesday Zoom Meeting
    7. Twentieth Zoom Meetings
    8. Zoom Meetings
  9. Other
    1. Featured Content
    2. Blog Posts
    3. Files
    4. Logbook
    5. EF ToDo List
    6. Link-Database
  1. Home
    1. Start Here: Study Guide
    2. Community Standards And Posting Policies
    3. Terms of Use
    4. Moderator Team
    5. Site Map
    6. Quizzes
    7. Articles
      1. Featured Articles
    8. All Blog Posts
      1. Elli's Blog / Articles
  2. Wiki
    1. Wiki Home
    2. FAQ
    3. Classical Epicureanism
    4. Physics Wiki
    5. Canonics Wiki
    6. Ethics Wiki
    7. Search Assistance
    8. Not NeoEpicurean
    9. Foundations
    10. Navigation Outlines
    11. Key Pages
  3. Forum
    1. Full Forum List
    2. Welcome Threads
    3. Physics
    4. Canonics
    5. Ethics
    6. Uncategorized Forum
    7. Study Resources Forum
    8. Ancient Texts Forum
    9. Shortcuts
    10. Featured
    11. Most Discussed
  4. Latest
    1. New Activity
    2. Latest Threads
    3. Dashboard
    4. Search By Tag
    5. Complete Tag List
  5. Podcast
    1. Lucretius Today Podcast
    2. Episode Guide
    3. Lucretius Today At Youtube
    4. EpicureanFriends Youtube Page
  6. Texts
    1. Overview
    2. Diogenes Laertius
    3. Principal Doctrines
    4. Vatican Sayings
    5. Lucretius
    6. Herodotus
    7. Pythocles
    8. Menoeceus
    9. Fragments - Usener Collection
    10. Torquatus On Ethics
    11. Velleius On Gods
    12. Greek/Latin Help
  7. Gallery
    1. Featured images
    2. Albums
    3. Latest Images
    4. Latest Comments
  8. Calendar
    1. Upcoming Events List
    2. Zoom Meetings
    3. This Month
    4. Sunday Zoom Meetings
    5. First Monday Zoom Meetings
    6. Wednesday Zoom Meeting
    7. Twentieth Zoom Meetings
    8. Zoom Meetings
  9. Other
    1. Featured Content
    2. Blog Posts
    3. Files
    4. Logbook
    5. EF ToDo List
    6. Link-Database
  1. EpicureanFriends - Home of Classical Epicurean Philosophy
  2. Frequently Asked Questions
  • Sidebar
  • Sidebar

What Is The Epicurean Science of Knowledge (the Canon of Truth)?

  • FAQ

We are now requiring that new registrants confirm their request for an account by email.  Once you complete the "Sign Up" process to set up your user name and password, please send an email to the New Accounts Administator to obtain new account approval.

Regularly Checking In On A Small Screen Device? Bookmark THIS page!

1. Knowledge Of Things That Are Relevant To Us Is Attainable If We Pursue That Knowledge In Ways Consistent With The Nature of The Universe Therefore it is an error to think that knowledge must be based on "forms" or "models" or "ideals" that are held to exist in another reality. This error leads to the belief that the things we experience around us originate from and are to be understood according to those nonexistent "forms." (Plato and others) It is an error to think that knowledge must be based on "essences" that are held to exist as a part within the things we experience around us, This error leads to the belief that the things we experience around us originate and are to be understood according to these nonexistent "essences." (Aristotle and others) It is an error to think that knowledge must be based on divine revelation or by reference to "gods" or "prime movers" who create all things according to their divine will. This error leads to the belief that the things around us originated and are to be understood according to religion. (Judaism, Christianity, and others)


2. Knowledge should be pursued by studying the facts of nature, which means that we must remember that we ourselves, as well as the subject of our knowledge, and our means of considering that knowledge, derive from (1) the eternal properties of the elementary matter, and (2) the temporary qualities of the bodies that are formed by the combinations of elementary matter and void.

3. The Faculties of Observation Provided By Nature Are The Tools By Which We Measure Truth. These are three in number and are collectively referred to as the Epicurean "Canon of Truth." They are (1) the "five senses," (2) the "feeings" of pleasure and pain, and (3) the "anticipations.

4. We should not seek to understand everything equally well, nor should we expect to understand that which is not possible for us to understand. We should seek to have firm convictions about those things which are necessary for our peace of mind. From the Letter to Pythocles: "In the first place, remember that, like everything else, knowledge of celestial phenomena, whether taken along with other things or in isolation, has no other end in view than peace of mind and firm convictions. We do not seek to wrest by force what is impossible, nor to understand all matters equally well, nor make our treatment always as clear as when we discuss human life or explain the principles of physics in general—for instance, that the whole of being consists of bodies and intangible nature, or that the ultimate elements of things are indivisible, or any other proposition which admits only one explanation of the phenomena to be possible."

5. "Reason" and "logic" are not in themselves faculties of observation like the three categories of the Canon of Truth. Diogenes Laertius - Biography of Epicurus: Every sensation, he says, is devoid of reason and incapable of memory; for neither is it self-caused nor, regarded as having an external cause, can it add anything thereto or take anything therefrom. Nor is there anything which can refute sensations or convict them of error: one sensation cannot convict another and kindred sensation, for they are equally valid; nor can one sensation refute another which is not kindred but heterogeneous, for the objects which the two senses judge are not the same; nor again can reason refute them, for reason is wholly dependent on sensation; nor can one sense refute another, since we pay equal heed to all. And the reality of separate perceptions guarantees the truth of our senses. But seeing and hearing are just as real as feeling pain. Hence it is from plain facts that we must start when we draw inferences about the unknown. For all our notions are derived from perceptions, either by actual contact or by analogy, or resemblance, or composition, with some slight aid from reasoning.

6. Therefore the opinions derived from "reason" or "logic" must constantly be tested against the data obtained from the canonical faculties. Opinions formed by reason should be concluded to be "true" when clear available evidence supports the conclusion, and no clear evidence contradicts the conclusion. Opinions formed by reason should be concluded to be "false" when clear available evidence contradicts the conclusion, and no clear evidence supports the conclusion. Opinions formed by reason which are not based on data from our faculties of observation, or on which the data from our faculties of observations is unclear, must not be considered "true," but considered "speculative" at best, and we must "wait" for additional evidence before concluding that the assertion is either true or false.

References and additional detail for this list may be found here.

Discussion of this FAQ entry is here.

Epicurus was considered a "dogmatist" because he held that confidence in certain conclusions is possible. Epicurus did not consider it necessary to have omniscience in order to be confident is stating that something can be known. He was very careful, however, to point out the limitations of the senses and the need to verify conclusions and to be open to new facts. Please see the discussion of epistemology in the FAQ here.

Unread Threads

    1. Title
    2. Replies
    3. Last Reply
    1. Immutability of Epicurean school in ancient times 15

      • Thanks 1
      • TauPhi
      • July 28, 2025 at 8:44 PM
      • Uncategorized Discussion (General)
      • TauPhi
      • September 10, 2025 at 7:08 AM
    2. Replies
      15
      Views
      6.4k
      15
    3. Cassius

      September 10, 2025 at 7:08 AM
    1. Boris Nikolsky - Article On His Interest in Classical Philosophy (Original In Russian) 1

      • Thanks 1
      • Cassius
      • September 6, 2025 at 5:21 PM
      • Articles Prepared By Professional Academics
      • Cassius
      • September 8, 2025 at 10:37 AM
    2. Replies
      1
      Views
      3.2k
      1
    3. Cassius

      September 8, 2025 at 10:37 AM
    1. Boris Nikolsky's 2023 Summary Of His Thesis About Epicurus On Pleasure (From "Knife" Magazine)

      • Cassius
      • September 6, 2025 at 5:32 PM
      • Articles Prepared By Professional Academics
      • Cassius
      • September 6, 2025 at 5:32 PM
    2. Replies
      0
      Views
      2.2k
    1. Edward Abbey - My Favorite Quotes 4

      • Love 4
      • Joshua
      • July 11, 2019 at 7:57 PM
      • Uncategorized Discussion (General)
      • Joshua
      • August 31, 2025 at 1:02 PM
    2. Replies
      4
      Views
      6.7k
      4
    3. SillyApe

      August 31, 2025 at 1:02 PM
    1. A Question About Hobbes From Facebook

      • Cassius
      • August 24, 2025 at 9:11 AM
      • Uncategorized Discussion (General)
      • Cassius
      • August 24, 2025 at 9:11 AM
    2. Replies
      0
      Views
      2.8k

Finding Things At EpicureanFriends.com

What's the best strategy for finding things on EpicureanFriends.com? Here's a suggested search strategy:

  • First, familiarize yourself with the list of forums. The best way to find threads related to a particular topic is to look in the relevant forum. Over the years most people have tried to start threads according to forum topic, and we regularly move threads from our "general discussion" area over to forums with more descriptive titles.
  • Use the "Search" facility at the top right of every page. Note that the search box asks you what section of the forum you'd like to search. If you don't know, select "Everywhere." Also check the "Search Assistance" page.
  • Use the "Tag" facility, starting with the "Key Tags By Topic" in the right hand navigation pane, or using the "Search By Tag" page, or the "Tag Overview" page which contains a list of all tags alphabetically. We curate the available tags to keep them to a manageable number that is descriptive of frequently-searched topics.

Frequently Used Forums

  • Frequently Asked / Introductory Questions
  • News And Announcements
  • Lucretius Today Podcast
  • Physics (The Nature of the Universe)
  • Canonics (The Tests Of Truth)
  • Ethics (How To Live)
  • Against Determinism
  • Against Skepticism
  • The "Meaning of Life" Question
  • Uncategorized Discussion
  • Comparisons With Other Philosophies
  • Historical Figures
  • Ancient Texts
  • Decline of The Ancient Epicurean Age
  • Unsolved Questions of Epicurean History
  • Welcome New Participants
  • Events - Activism - Outreach
  • Full Forum List

Latest Posts

  • Episode 298 - TD26 - Facts And Feelings In Epicurean Philosophy - Part 1"

    Don September 15, 2025 at 10:52 PM
  • Episode 299 - TD27 - Was Epicurus Right To Maintain That There Are Only Two Feelings? Not Yet Released

    Cassius September 15, 2025 at 6:22 PM
  • Specific Methods of Resistance Against Our Coming AI Overlords

    Pacatus September 15, 2025 at 3:52 PM
  • Comparing The Pleasure of A Great Physicist Making A Discovery To The Pleasure of A Lion Eating A Lamb

    Cassius September 14, 2025 at 6:09 AM
  • Fragment 32 -- The "Shouting To All Greeks And Non-Greeks That Virtue Is Not The Goal" Passage

    Don September 13, 2025 at 10:32 AM
  • Latest Podcast Posted - "Facts And Feelings In Epicurean Philosophy - Part 1"

    Cassius September 12, 2025 at 4:55 PM
  • The Role of Virtue in Epicurean Philosophy According the Wall of Oinoanda

    Kalosyni September 12, 2025 at 9:26 AM
  • Bodily Sensations, Sentience and AI

    Patrikios September 11, 2025 at 5:05 PM
  • Additional Timeline Details Needed

    Eikadistes September 11, 2025 at 12:15 PM
  • Surviving References To Timasagorus

    Cassius September 10, 2025 at 7:39 AM

Frequently Used Tags

In addition to posting in the appropriate forums, participants are encouraged to reference the following tags in their posts:

  • #Physics
    • #Atomism
    • #Gods
    • #Images
    • #Infinity
    • #Eternity
    • #Life
    • #Death
  • #Canonics
    • #Knowledge
    • #Scepticism
  • #Ethics

    • #Pleasure
    • #Pain
    • #Engagement
    • #EpicureanLiving
    • #Friendship
    • #Happiness
    • #Virtue
      • #Wisdom
      • #Temperance
      • #Courage
      • #Justice
      • #Honesty
      • #Faith (Confidence)
      • #Friendship
      • #Suavity
      • #Consideration
      • #Hope
      • #Gratitude



Click Here To Search All Tags

To Suggest Additions To This List Click Here

EpicureanFriends - Classical Epicurean Philosophy

  1. Home
    1. About Us
    2. Classical Epicurean Philosophy
  2. Wiki
    1. Getting Started
  3. Frequently Asked Questions
    1. Site Map
  4. Forum
    1. Latest Threads
    2. Featured Threads
    3. Unread Posts
  5. Texts
    1. Core Texts
    2. Biography of Epicurus
    3. Lucretius
  6. Articles
    1. Latest Articles
  7. Gallery
    1. Featured Images
  8. Calendar
    1. This Month At EpicureanFriends
Powered by WoltLab Suite™ 6.0.22
Style: Inspire by cls-design
Stylename
Inspire
Manufacturer
cls-design
Licence
Commercial styles
Help
Supportforum
Visit cls-design