Stupidity is a personal achievement which transcends national boundaries.

Empathy is patiently and sincerely seeing the world through the other person's eyes. It is not learned in school; it is cultivated over a lifetime.

It is my inner conviction that the development of science seeks in the main to satisfy the longing for pure knowledge.

Earth is the insane asylum of the universe.

There is possibility in every difficulty.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

I always have a high regard for the individual and have an insuperable distaste for violence and clubmanship. All these motives made me into a passionate pacifist and anti-militarist. I am against any nationalism, even in the guise of mere patriotism. Privileges based on position and property have always seemed to me unjust and pernicious, as did any exaggerated personality cult.