It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

Toreador pants make your feet look big too

A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.

You can never solve a problem on the level on which it was created. Insanity: doing the same thing over and over again and expecting different results. A life lived for others is a life worthwhile.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

I am not a positivist. Positivism states that what cannot be observed does not exist. This conception is scientifically indefensible, for it is impossible to make valid affirmations of what people 'can' or 'cannot' observe. One would have to say 'only what we observe exists,' which is obviously false.

Imagination is vastly more important than intelligence.