Look deep into nature, and then you will understand everything better.

What I seek to accomplish is simply to serve with my feeble capacity truth and justice, at the risk of pleasing no one.

I am enough of an artist to draw freely upon my imagination.

Fantasie is belangrijker dan kennis, want kennis is begrensd.

I believe that pipe smoking contributes to a somewhat calm and objective judgement in all human affairs.

The physicists say that I am a mathematician, and the mathematicians say that I am a physicist. I am a completely isolated man and though everybody knows me, there are very few people who really know me.

I believe, indeed, that overemphasis on the purely intellectual attitude, often directed solely to the practical and factual, in our education, has led directly to the impairment of ethical values.