The dangers that face the world can, every one of them, be traced back to science. The salvations that may save the world will, every one of them, be traced back to science.

When asked for advice by beginners. Know your ending, I say, or the river of your story may finally sink into the desert sands and never reach the sea.

The true artist is quite rational as well as imaginative and knows what he is doing; if he does not, his art suffers.

Politically popular speech has always been protected: even the Jews were free to say ‘Heil Hitler.’

In life, unlike chess, the game continues after checkmate.

When life is so harsh that a man loses all hope in himself, then he raises his eyes to a shining rock, worshipping it, just to find hope again, rather than looking to his own acts for hope and salvation. Yes, atheism IS a redemptive belief. It is theism that denies man's own redemptive nature.

And in man is a three-pound brain which, as far as we know, is the most complex and orderly arrangement of matter in the universe.