Mathematics is the language in which the gods talk to people.

We are bound to our bodies like an oyster to its shell.

Let us describe the education of our men. What then is the education to be? Perhaps we could hardly find a better than that which the experience of the past has already discovered, which consists, I believe, in gymnastic, for the body, and music for the mind.

Excellent things are rare.

If the study of all these sciences which we have enumerated, should ever bring us to their mutual association and relationship, and teach us the nature of the ties which bind them together, I believe that the diligent treatment of them will forward the objects which we have in view, and that the labor, which otherwise would be fruitless, will be well bestowed.

Excess of liberty, whether it lies in state or individuals, seems only to pass into excess of slavery.

Seven years of silent inquiry are needful for a man to learn the truth, but fourteen in order to learn how to make it known to his fellow-men.