Q. You do not consider your statement a disloyal one? A. No, sir. Scientific truth is beyond loyalty and disloyalty. Q. You are sure that your statement represents scientific truth? A. I am.

Economics is on the side of humanity now.

Junz found revulsion growing strong within him. A planet full of people meant nothing against the dictates of economic necessity!

No one is so modest as not to believe himself a competent amateur sleuth.

First, there must be an end to war and national rivalry and only then could one turn to the internal miseries that, after all, had external conflict as their chief cause.

The Law of conservation of energy tells us we can't get something for nothing, but we refuse to believe it.

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

All mankind, right down to those you most despise, are your neighbors.

Writing is an addiction more powerful than alcohol, than nicotine, than crack. I could not conceive of not writing.

Radiation, unlike smoking, drinking, and overeating, gives no pleasure, so the possible victims object.

Books ... hold within them the gathered wisdom of humanity, the collected knowledge of the world's thinkers, the amusement and excitement built up by the imaginations of brilliant people. Books contain humor, beauty, wit, emotion, thought, and, indeed, all of life. Life without books is empty.

The foundation of all technology is fire.

If anyone can be considered the greatest writer who ever lived, it is Shakespeare.

Science doesn't purvey absolute truth. Science is a mechanism. It's a way of trying to improve your knowledge of nature. It's a system for testing your thoughts against the universe and seeing whether they match. And this works, not just for the ordinary aspects of science, but for all of life. I should think people would want to know that what they know is truly what the universe is like, or at least as close as they can get to it.

Of all the cultural aspects of humanity, the only one which is not broken up into national or regional splinters is science. Different nations have different languages, they may have different religions, may have different dietaries, may have different holidays, different ways of thinking, but here's only one science. 

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!', but 'That's funny ...'

Consider the most famous pure dystopian tale of modern times, 1984, by George Orwell (1903-1950), published in 1948 (the same year in which Walden Two was published). I consider it an abominably poor book. It made a big hit (in my opinion) only because it rode the tidal wave of cold war sentiment in the United States.

Miniaturization doesn't actually make sense unless you miniaturize the very atoms of which matter is composed. Otherwise a tiny brain in a man the size of an insect, composed of normal atoms, is composed of too few atoms for the miniaturized man to be any more intelligent than the ant. Also, miniaturizing atoms is impossible according to the rules of quantum mechanics.

Titles are an important part of a story and I take considerable care in choosing one. In fact, I cannot start a story until I have chosen a title.

Once you've dissected a joke, you're about where you are when you've dissected a frog. It's dead. Banquets of the Black Widowers (1984), p. 49; comparable to "Humor can be dissected, as a frog can, but the thing dies in the process and the innards are discouraging to any but the pure scientific mind."

In my fiction I am careful to make everything probable and to tie up all loose ends. Real life is not hampered by such considerations.

Science fiction offers its writers chances of embarrassment that no other form of fiction does.

There is more to a science fiction story than the science it contains.

There are limits beyond which your folly will not carry you. I am glad of that. In fact, I am relieved.

Scientific theories can always be improved and are improved. That is one of the glories of science. It is the authoritarian view of the Universe that is frozen in stone and cannot be changed, so that once it is wrong, it is wrong forever.

It's my belief that the Universe possesses, in its essence, fractal properties of a very complex sort and that the pursuit of science shares those properties. It follows that any part of the Universe that remains un-understood, and any part of scientific investigation that remains unresolved, however small that might be in comparison to what is understood and resolved, contains within it all the complexity of the original. Therefore, we'll never finish. No matter how far we go, the road ahead will be as long as it was at the start, and that's the secret of the Universe.

Earth governments in moments of stress are not famous for being reasonable.

Modesty is an unnatural attitude, and one which is only with difficulty taught to children.

Self-preservation has frequently knuckled under to that tremendous yearning to get even.

What a human being believes, however, no matter with what ardor, is not necessarily objective truth.

He could almost wish he were superstitious. He could then console himself with the thought that the casual meaningless meeting had really been directed by a knowing and purposeful Fate.

We face eternity now. We have no universe left, no outside phenomena, no emotions, no passions. Nothing but ourselves and thought. We face an eternity of introspection, when all through history we have never known what to do with ourselves on a rainy Sunday.

The Dantean conceptions of Inferno were childish and unworthy of the Divine imagination: fire and torture. Boredom is much more subtle. The inner torture of a mind unable to escape itself in any way, condemned to fester in its own exuding mental pus for all time, is much more fitting. Oh, yes, my friend, we have been judged, and condemned, too, and this is not Heaven, but hell.

"Why didn't people just use a computer?" "That was before they had computers," cried Paul. "Before?" "Sure. Do you think people always had computers? Didn't you ever hear of cavemen?"

If the love of money is the root of all evil, the need of money is most certainly the root of all despair.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

The job of science will never be done, it will just sink deeper and deeper into never-ending complexity.

Ideas are cheap. It's only what you do with them that counts.

In the course of my fight with the school, I couldn't help but notice that I became a pariah. [...] Once, however, a fellow faculty member, making sure we were unobserved, said to me, "Isaac, the faculty is proud of you for your courage in fighting the administration for academic freedom."I said, "There's no courage involved in it. Don't you know my definition of academic freedom?""No. What's your definition of academic freedom?"I said, "Independent income."

I was once being interviewed by Barbara Walters [...] In between two of the segments she asked me [...] "But what would you do if the doctor gave you only six months to live?" I said, "Type faster." This was widely quoted, but the "six months" was changed to "six minutes," which bothered me. It's "six months."

If you suspect that my interest in the Bible is going to inspire me with sudden enthusiasm for Judaism and make me a convert of mountain‐moving fervor and that I shall suddenly grow long earlocks and learn Hebrew and go about denouncing the heathen — you little know the effect of the Bible on me. Properly read, it is the most potent force for atheism ever conceived.

I don't believe in an afterlife, so I don't have to spend my whole life fearing hell, or fearing heaven even more. For whatever the tortures of hell, I think the boredom of heaven would be even worse.

A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.

Printing will tell you such useful things and such interesting things that not being able to read would be as bad as not being able to see.

I get a certain pleasure in knowing that I live not merely in a city but in Manhattan, the center of New York City, a region so unique in many ways that I honestly believe that Earth is divided into halves: Manhattan and non-Manhattan.

The best way to describe anyone is to give an example of the kind of thing he would do.

Of all the books I have ever worked on, I think Asimov's Guide to Shakespeare gave me the most pleasure, day in, day out. For months and months I lived and thought Shakespeare, and I don't see how there can be any greater pleasure in the world, any pleasure, that is, that one can indulge in for as much as ten hours without pause, day after day indefinitely.

No matter how various the subject matter I write on, I was a science-fiction writer first and it is as a science-fiction writer that I want to be identified.

I joke sometimes to the effect that when I approach a part of a book where I must explain something I don't understand, I just type faster and faster and faster. Then, when I get to the part I don't understand, sheer inertia pushes me through. That's not literally true, of course, but there's something to it psychologically.