"An unconsidered life is not one worth living."

"The mind is everything; what you think you become."

"All I know is that I know nothing."

"I honor and love you: but why do you who are citizens of the great and mighty nation care so much about laying up the greatest amount of money and honor And reputation, and so little amount wisdom and truth and the greatest improvement of the soul? Re you not ashamed of these?... I do nothing but go about persuading you all, not to take thought for your persons and your properties, but first and chiefly to care about the greatest improvement of the soul. I tell you that virtue is not given by more, but that from virtue comes money and every other good of man."

"I decided that it was not wisdom that enabled [poets] to write their poetry, but a kind of instinct or inspiration, such as you find in seers and prophets who deliver all their sublime messages without knowing in the least what they mean."

"Strong minds discuss ideas, average minds discuss events, weak minds discuss people."