As to marriage or celibacy, let a man take which course he will, he will be sure to repent
I know that I am intelligent, because I know that I know nothing.
A free soul ought not to pursue any study slavishly, for nothing that is learned under compulsion stays with the mind.
Are not all things which have opposites generated out of their opposites?
The unexamined life is not worth living.
Is there anyone to whom you entrust a greater number of serious matters than your wife? And is there anyone with whom you have fewer conversations?