O philosophy, you leader of life.

That he who hath the loan of money has not repaid it, and he who has repaid has not the loan; but he who has acknowledged a kindness has it still, and he who has a feeling of it has requited it.

It is foolish to tear one's hair in grief, as though sorrow would be made less by baldness.

Art is born of the observation and investigation of nature.

Old age: the crown of life, our play's last act.

To know the laws is not to memorize their letter but to grasp their full force and meaning.

Who does not know that the first law of historical writing is the truth.