Only a good-for-nothing is not interested in his past.

In so doing, the idea forces itself upon him that religion is comparable to a childhood neurosis, and he is optimistic enough to suppose that mankind will surmount this neurotic phase, just as so many children grow out of their similar neurosis.

No, our science is no illusion. But an illusion it would be to suppose that what science cannot give us we can get elsewhere.

The reproaches against science for not having yet solved the problems of the universe are exaggerated in an unjust and malicious manner; it has truly not had time enough yet for these great achievements. Science is very young--a human activity which developed late.

America is the most grandiose experiment the world has seen, but, I am afraid, it is not going to be a success.

One feels inclined to say that the intention that man should be 'happy' is not included in the plan of Creation.' . . . We are so made that we can derive intense enjoyment only from a contrast and very little from a state of things.

The inclination to aggression constitutes the greatest impediment to civilization.