The things best to know are first principles and causes, but these things are perhaps the most difficult for men to grasp, for they are farthest removed from the senses.

The honors and rewards fall to those who show their good qualities in action.

Imagination is a sort of faint perception.

What you have to learn to do, you learn by doing.

To be conscious that we are perceiving or thinking is to be conscious of our own existence.

Something is infinite if, taking it quantity by quantity, we can always take something outside.

Man perfected by society is the best of all animals; he is the most terrible of all when he lives without law and without justice. If he finds himself an individual who cannot live in society, or who pretends he has need of only his own resources do not consider him as a member of humanity; he is a savage beast or a god.