Hatred is active, and envy passive dislike; there is but one step from envy to hate.

Nothing is more consonant with Nature than that she puts into operation in the smallest detail that which she intends as a whole.

The heights charm us, but the steps do not; with the mountain in our view we love to walk the plains.

Mysteries are not necessarily miracles.

I have heard myself accused of being an opponent, an enemy of mathematics, which no one can value more highly than I, for it accomplishes the very thing whose achievement has been denied me.

Alas! sorrow from happiness is oft evolved.

We amuse ourselves painting our prison-walls with bright figures and brilliant landscapes.