Wisest is he who knows he knows not.
Every pleasure or pain has a sort of rivet with which it fastens the soul to the body and pins it down and makes it corporeal, accepting as true whatever the body certifies.
Whatever authority I may have rests solely on knowing how little I know.
Admitting one's ignorance is the first step in acquiring knowledge.
I am a citizen, not of Athens, or Greece, but of the world.
What a lot of things I don't need.