Teach by doing whenever you can, and only fall back upon words when doing it is out of the question.

The most absolute authority is that which penetrates into a man's innermost being and concerns itself no less with his will than with his actions.

Childhood is the sleep of reason.

Liberty may be gained, but can never be recovered.

It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist.

An intelligent being, is the active principle of all things. One must have renounced all common sense to doubt it, and it is a waste of time to try to prove such self evident truth.

Nature never deceives us; it is we who deceive ourselves.