Whoever blushes is already guilty; true innocence is ashamed of nothing.

One can buy anything with money except morality.

Everything made by man may be destroyed by man; there are no ineffaceable characters except those engraved by nature; and nature makes neither princes nor rich men nor great lords.

He who blushes is already guilty.

Do I dare set forth here the most important, the most useful rule of all education? It is not to save time, but to squander it.

Teach your scholar to observe the phenomena of nature; you will soon rouse his curiosity, but if you would have it grow, do not be in too great a hurry to satisfy this curiosity. Put the problems before him and let him solve them himself. Let him know nothing because you have told him, but because he has learnt it for himself. Let him not be taught science, let him discover it. If ever you substitute authority for reason he will cease to reason; he will be a mere plaything of other people's thoughts.

Do to others as you would have others do to you, inspires all men with that other maxim of natural goodness a great deal less perfect, but perhaps more useful: Do good to yourself with as little prejudice as you can to others.