We don't get to know anything but what we love.

In society every man is taken for what he gives himself out to be; but he must give himself out to be something. Better to be slightly disagreeable than altogether insignificant.

Who can think wise or stupid things at all that were not thought already in the past.

Superstition is part of the poetry of life.

Die Mathematiker sind eine Art Franzosen. Spricht man zu ihnen, so übersetzen sie alles in ihre eigene Sprache, und so wird es alsobald etwas ganz anderes. Mathematicians are a kind of Frenchmen. Whenever you say anything or talk to them, they translate it into their own language, and right away it is something completely different.

Sometimes I don't understand how another can love her, is allowed to love her, since I love her so completely myself, so intensely, so fully, grasp nothing, know nothing, have nothing but her!

It is not doing the thing we like to do, but liking the thing we have to do, that makes life blessed.