If anyone spends almost the whole day in reading...he gradually loses the capacity for thinking...This is the case with many learned persons; they have read themselves stupid

Any book, which is at all important, should be reread immediately

A man can do what he wants, but not want what he wants.

Pantheism is only a polite form of atheism.

A man of talent will strive for money and reputation; but the spring that moves genius to the production of its works is not as easy to name

Mensch kann tun was er will; er kann aber nicht wollen was er will. (One can choose what to do, but not what to want.)

A reproach can only hurt if it hits the mark. Whoever knows that he does not deserve a reproach can treat it with contempt.