Protagoras

No intelligent man believes that anybody ever willingly errs or willingly does base and evil deeds; they are well aware that all who do base and evil things do them unwillingly.

As to gods, I have no way of knowing either that they exist or do not exist, or what they are like.

Man is the measure of all things.

Imperialism was genuinely popular among Athenians who would expect to share in its profits, even if only indirectly and collectively, and not to have to bear its burdens.

Children don't need much advice but they really do need to be listened to and not just with half an ear.

If every time you engage in a sex act, you go into a confession box, you will never accept your own sexuality.