Stupidity is without anxiety.

Don't say that you want to give, but go ahead and give! You'll never catch up with a mere hope.

Any trifle is enough to entertain two lovers.

The finished man, you know, is difficult to please; a growing mind will ever show you gratitude. --Faust 1, lines 182-3

Mathematics can remove no prejudices and soften no obduracy. It has no influence in sweetening the bitter strife of parties, and in the moral world generally its action is perfectly null.

He who possesses art and science has religion; he who does not possess them, needs religion.

Unrest and uncertainty are our lot.