Man can find no better retreat from the world than art, and man can find no stronger link with the world than art.

Science has been seriously retarded by the study of what is not worth knowing and of what is not knowable.

We all walk in mysteries. We are surrounded by an atmosphere about which we still know nothing at all.

Beware of dissipating your powers; strive constantly to concentrate them.

First let a man teach himself, and then he will be taught by others.

Difficulties increase the nearer we get to the goal.

Human life runs its course in the metamorphosis between receiving and giving.