Let us not dream that reason can ever be popular. Passions, emotions, may be made popular; but reason remains ever the property of an elect few.

Collectors are happy people.

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.

Every author in some way portrays himself in his works, even if it be against his will.

Everything we do has a result. But that which is right and prudent does not always lead to good, nor the contrary to what is bad.

The older we get the more we must limit ourselves if we wish to be active.

What you can do, or think you can, begin it.