Many die too late, and some die too early. Yet strangers soundeth the precept: "Die at the right time!"

The transition from Religion to Scientific contemplation is a violent, dangerous leap, which is not to be recommended. In order to make this transition, art is far rather to be employed to relieve the mind overburdened with emotions. Out of the illogical comes much good. It is so firmly rooted in the passions, in language, in art, in religion, and generally in everything which gives value to life. It is only the naive people who can believe that the nature of man can be changed into a purely logical one. We have yet to learn that others can suffer, and this can never be completely learned.

Whenever I climb I am followed by a dog called 'Ego'.

What is the vanity of the vainest man compared with the vanity which the most modest possesses when, in the midst of nature and the world, he feels himself to be man!

The wheel and the brake have different duties, but also one in common: to hurt one another.

I climb upon the highest mountains, laughing at all tragedies - whether real or imaginary.

Women and egoistic artists entertain a feeling towards science that is something composed of envy and sentimentality.