The greatest step forward would be to see that everything factual is already theory. The blueness of the sky reveals the basic lawof chromatics. Don't look for anything behind the phenomena, they themselves are the doctrine.

God help us -- for art is long, and life so short.

It is bad governments, not bad people, who cause revolutions.

Experiments are mediators between nature and idea.

One cannot develop taste from what is of average quality but only from the very best.

Everything has been thought of before, but the problem is to think of it again.

He who does not know foreign languages does not know anything about his own.