I will not allow the Athenians to sin twice against philosophy.

The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.

Saying the words that come from knowledge is no sign of having it.

Marriage is like retiring as a bachelor and getting a sexual pension. You don't have to work for the sex any more, but you only get 65% as much.

Excellence or virtue in a man will be the disposition which renders him a good man and also which will cause him to perform his function well.

Education is an ornament in prosperity and a refuge in adversity.

No great mind has ever existed without a touch of madness.