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.

What a man does not understand, he does not possess.

Plunge boldly into the thick of life!

In the end we retain from our studies only that which we practically apply.

True art can only spring from the intimate linking of the serious and the playful.

A phenomenon like Mozart remains an inexplicable thing.

And step by step, along the path of life, There's nothing true but Heaven.