If the world does improve on the whole, yet youth must always begin anew, and go through the stages of culture from the beginning.

Habit is a man's sole comfort. We dislike doing without even unpleasant things to which we have become accustomed.

He is the happiest man who can see the connection between the end and the beginning of life.

I am what I am, so take me as I am!.

Two souls dwell, alas! in my breast.

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.

Publishers are all cohorts of the devil; there must be a special hell for them somewhere.