Ok, I'm going to play devil's advocate a bit.
That's certainly a piece of evidence, but the fact that infants or animals do something hardly proves that rational adult humans do it. Much less that they ought to do it.
I think those things are both true (we do, and we should). I just don't think that particular argument is very convincing to someone who doesn't already agree with the conclusion. Some big logical holes there.
What else have you got? ![]()
Edit: Sorry, Joshua , I hope that didn't seem like an assault out of nowhere! I like your connection between the descriptive and normative aspects. I was just wondering if we have any other arguments of Epicurus as to why pleasure? Seems like an important thing to establish, and this argument feels flimsy.