Wandering re-establishes the original harmony which once existed between man and the universe.

Jealousy is a virtue of democracies which preserves them from tyrants.

The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards.

One thing above all gives charm to men's thoughts, and this is unrest. A mind that is not uneasy irritates and bores me.

In its majestic equality, the law forbids rich and poor alike to sleep under bridges, beg in the streets and steal loaves of bread.

I thank fate for having made me born poor. Poverty taught me the true value of the gifts useful to life.

Universal peace will be realized, not because man will become better, but because a new order of things, a new science, new economic necessities, will impose peace.