What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion.

You cannot love a car the way you love a horse. The horse brings out human feelings the way machines cannot do. Things like machines may develop or neglect certain things in people ... Machines make our life impersonal and stultify certain elements in us and create an impersonal environment.

Berlin is the place to which I am most closely bound by human and scientific ties.

No, this trick won't work... How on earth are you ever going to explain in terms of chemistry and physics so important a biological phenomenon as first love?

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

Women always worry about things that men forget; men always worry about things women remember.

The most important question a person can ask is, "Is the Universe a friendly place?