I don't believe in personal immortality; the only way I expect to have some version of such a thing is through my books.

Saying something is 'too bad' is easy. You say you disapprove, which makes you a nice person, and then you can go about your business and not be interested anymore. It's a lot worse than 'too bad.' It's against everything decent and natural.

No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.

Once, when a religionist denounced me in unmeasured terms, I sent him a card saying, "I am sure you believe that I will go to hell when I die, and that once there I will suffer all the pains and tortures the sadistic ingenuity of your deity can devise and that this torture will continue forever. Isn't that enough for you? Do you have to call me bad names in addition?"

Where any answer is possible, all answers are meaningless.

There never can be a man so lost as one who is lost in the vast and intricate corridors of his own lonely mind, where none may reach and none may save.

Any teacher that can be replaced by a computer should be replaced by a computer.