If children grew up according to early indications, we should have nothing but geniuses.

A man is not little when he finds it difficult to cope with circumstances, but when circumstances overmaster him.

The mark of highest originality lies in the ability to develop a familiar idea so fruitfully that it would seem no one else would ever have discovered so much to be hidden in it.

Faith is like private capital, stored in one's own house. It is like a public savings bank or loan office, from which individuals receive assistance in their days of need; but here the creditor quietly takes his interest for himself.

A useless life is an early death.

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

Man errs, till he has ceased to strive.