Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.

Nothing causes more consternation in a group of hypocrits than one honest man.

My pacifism is not based on any intellectual theory but on a deep antipathy to every form of cruelty and hatred.

Growth comes through analogy; through seeing how things connect, rather than only seeing how they might be different.

It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure.

Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.

All our thinking is of this nature, a free play with concepts.