To receive applause for works which do not demand all our powers hinders our advance towards a perfecting of our spirit. It usually means that thereafter we stand still.

A man is never more serious than when he praise himself.

With God thoughts are colors, with us they are pigments-even the most abstract one may be accompanied by physical pain.

We have to believe that everything has a cause, as the spider spins its web in order to catch flies. But it does this before it knows there are such things as flies.

Barbaric accuracy - whimpering humility.

There are people who possess not so much genius as a certain talent for perceiving the desires of the century, or even of the decade, before it has done so itself.

Do not say hypothesis, and even less theory: say way of thinking.