I am an atheist, out and out. It took me a long time to say it. I've been an atheist for years and years, but somehow I felt it was intellectually unrespectable to say that one is an atheist, because it assumed knowledge that one didn't have. Somehow it was better to say one was a humanist or agnostic. I don't have the evidence to prove that God doesn't exist, but I so strongly suspect that he doesn't that I don't want to waste my time.

To succeed, planning alone is insufficient. One must improvise as well.

Part of the inhumanity of the computer is that, once it is competently programmed and working smoothly, it is completely honest.

It pays to be obvious, especially if you have a reputation for subtlety.

I am not responsible for what other people think. I am responsible only for what I myself think, and I know what that is. No idea I've ever come up with has ever struck me as a divine revelation. Nothing I have ever observed leads me to think there is a God watching over me.

A scientist is as weak and human as any man, but the pursuit of science may ennoble him even against his will.

Today's science fiction is tomorrow's science fact.