A scientist is a mimosa when he himself has made a mistake, and a roaring lion when he discovers a mistake of others.

The State idea is not according to my heart. I cannot understand why it is needed. It is connected with narrow-minded and economic obstacles. I believe it is bad. I have always been against it.

I think we have to safeguard ourselves against people who are a menace to others, quite apart from what may have motivated their deeds.

I appeal to all men and women, whether they be eminent or humble, to declare that they will refuse to give any further assistance to war or the preparation of war.

I became more and more convinced that even nature could be understood as a relatively simple mathematical structure.

Highly developed spirits often encounter resistance from mediocre minds.

The only real valuable thing is intuition.