Never lose a holy curiosity. Try not to become a man of success but rather try to become a man of value. He is considered successful in our day who gets more out of life than he puts in. But a man of value will give more than he receives.

In art, and in the higher ranges of science, there is a feeling of harmony which underlies all endeavor. There is no true greatness in art or science without that sense of harmony.

The trite objects of human efforts-possessions, superficial success, luxury-have always seemed contemptible to me.

Qualities I sought in a scientific theory were naturalness, inner perfection and logical simplicity from an aesthetic approach.

Well-being and happiness never appeared to me as an absolute aim. I am even inclined to compare such moral aims to the ambitions of a pig.

I am a determinist. As such, I do not believe in free will...Practically, I am, nevertheless, compelled to act as if freedom of the will existed. If I wish to live in a civilized community, I must act as if man is a responsible being.

We must dedicate our lives to drying up the source of war: ammunition factories.