Nature is, after all, the only book that offers important content on every page.

Nature understands no jesting. She is always true, always serious, always severe. She is always right, and the errors are always those of man.

The senses do not deceive us, but the judgment does.

The most damaging prejudice consists of banning any kind of investigation of nature.

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

It is always a sign of an unproductive time when it concerns itself with petty and technical aspects [in philology], and likewiseit is a sign of an unproductive person to pursue such trifles.

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.