The tools which would teach men their own use would be beyond price.

If you ask: What is the good of education? The answer is easy: Education makes good men and good men act nobly.

It is through geometry that one purifies the eye of the soul.

Lessons, however, that enter the soul against its will never grow roots and will never be preserved inside it.

But tell me, this physician of whom you were just speaking, is he a moneymaker, an earner of fees, or a healer of the sick?

To be at once exceedingly wealthy and good is impossible.

The real tragedy of life is when men are afraid of the light.