No two people see the world exactly alike, and different temperaments will often apply the same principle, recognized by both, differently. Even one and the same person won't always maintain the same views and judgments: earlier convictions must give way to later ones.

If you wish to know the mind of a man, listen to his words.

Flowers are the beautiful hieroglyphics of nature with which she indicates how much she loves us.

What have the Germans gained by their boasted freedom of the press, except the liberty of abusing each other as they like?

Truth has to be repeated constantly, because Error also is being preached all the time, and not just by a few, but by the multitude. In the Press and Encyclopaedias, in Schools and Universities, everywhere Error holds sway, feeling happy and comfortable in the knowledge of having Majority on its side.

Properly speaking, such work is never finished; one must declare it so when, according to time and circumstances, one has done one's best.

I have heard myself accused of being an opponent, an enemy of mathematics, which no one can value more highly than I, for it accomplishes the very thing whose achievement has been denied me.