I have never written a book that didn't teach me far more than it taught my reader..

Fertility is hereditary. If your parents didn't have any children, neither will you. I do not fear computers. I fear the lack of them..

It is always useful, you see, to subject the past life of reform politicians to rather inquisitive research..

Words are a pretty fuzzy substitute for mathematical equations..

Before another century is done it will be hard for people to imagine a time when humanity was confined to one world, and it will seem to them incredi….

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, rathe….

The Master created humans first as the lowest type, most easily formed. Gradually, he replaced them by robots, the next higher step, and finally he c….

The spell of power never quite releases its hold..

Inertia! Our ruling class knows one law; no change. Despotism! They know one rule; force. Maldistribution! They know one desire; to hold what is thei….

I don't think I've ever held a racket in my hand ... There's got to be somebody in the US who isn't trying to play tennis and stinking up the court..

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 un….

What do you call that nice, shiny white metal they use to make sidings and airplanes out of? Aluminum, right? Aluminum, pronounced 'uh-LOO-mih-num', ….

All normal life, Peter, consciously or otherwise, resent domination. If the domination is by an inferior, or by a supposed inferior, the resentment b….

I, on the other hand, am a finished product. I absorb electrical energy directly and utilize it with an almost one hundred percent efficiency. I am c….

Married life had taught Toran the futility of arguing with a female in a dark-brown mood..

Scientific truth is beyond loyalty and disloyalty..

To bring about destruction by overcrowding, mass starvation, anarchy, the destruction of our most cherished values, there is no need to do anything. ….

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

The world of A.D. 2014 will have few routine jobs that cannot be done better by some machine than by any human being. Mankind will therefore have bec….

The intelligent man is never bored..

Naturally, there's got to be a limit for I don't expect to live forever, but I do intend to hang on as long as possible..