There are men whose manners have the same essential splendor as the simple and awful sculpture on the friezes of the Parthenon, and the remains of the earliest Greek art.

The greatest man in history was the poorest.

At the gates of the forest, the surprised man of the world is forced to leave his city estimates of great and small, wise and foolish.

The only prudence in life is concentration.

Five great enemies of peace inhabit us: avarice, ambition, envy, anger and pride.

Everything in nature goes by law, and not by luck.

Conversation is the laboratory and workshop of the student.