no absolute basis for ethics - that everything ultimately rests on the feelings of pleasure and pain
I feel the need to say something in response to this (and we must have a thread on this already) -- no absolute basis for ethics means that we don't do things to please God or to attempt to prove that we are perfectly behaving according to some ideal standard, but instead we act ethically because it brings pleasure and a happy life. And we make ethical choices based on pleasure and pain -- not just my own pleasure or avoidance of pain, but that if I cause pain in someone else it will usually (but yet not always in every case) result in more pain for myself. Now we can go a step further and apply a kind of heuristic which is that we will more quickly guess (or sense) whether or not we are causing pain to someone, and then be sure to avoid any behavior that might cause pain. The usual impulse is when a human feels pain then a reaction results, as we naturally seek to find a way to end the pain, whether or not the method found to end the pain actually works or not. So if I hurt you in some way, even if it is by accident, then you look around to see who or what hurt you (and then you react in myriad ways in response).
I just think that this ethical understanding needs to be clear. Any thoughts Cassius?