The fact is that I've never called myself a genius, and I think the term has been cheapened by overuse into meaninglessness. If other people want to call me that, that's their problem.

Writing is hard work. The fact that I love doing it doesn't make it less hard work. People who love tennis will sweat themselves to exhaustion playing it, and the love of the game doesn't stop the sweating. The casual assumption that writers are unemployed bums because they don't go to the office and don't have a boss is something every writer has to live with. I have never known a writer who hasn't suffered as a result of this, hasn't resented it, and hasn't dreamed of murdering the next person who says "Boy, you've sure got it made. You just sit there and toss off a story or something whenever you feel like it."

I am not a visual person. I have spent so many bounded years in my childhood that I have grown used to having books as my window on reality.

Someone once asked me, "If you had your choice, Dr. Asimov, would it be women or writing?" My answer was, "Well, I can write for twelve hours at a time without getting tired."

People don't stop things they enjoy doing just because they reach a certain age. They don't stop playing tennis just because they turn 40, they don't stop with sex just because they turn 40; they keep it up as long as they can if they enjoy it, and learning will be the same thing.

There are many aspects of the universe that still cannot be explained satisfactorily by science; but ignorance only implies ignorance that may someday be conquered. To surrender to ignorance and call it God has always been premature, and it remains premature today.

An optimistic view of the future would indicate that before long, the clear necessity of expanding humanity's horizons would cause ... space settlements to be built. The construction would also serve as a great project that not only would be clearly of great benefit, but might induce human cooperation in something large enough to fire the heart and mind, and make people forget the petty quarrels that have engaged them for thousands of years in wars over insignificant scraps of earthly territory.

Earth is a ball that is over 12,000 kilometres in diameter, and if it were modelled into an object the size of a billiard ball, with all its surface unevenness reproduced exactly to scale, the model would be smoother than an ordinary billiard ball and the ocean would be an all but unnoticeable mist of dampness over 70 percent of its surface.

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 one was an atheist, because it assumed knowledge that one didn't have. Somehow, it was better to say one was a humanist or an agnostic. I finally decided that I'm a creature of emotion as well as of reason. Emotionally, I am an atheist. I don't have the evidence to prove that God doesn't exist, but I so strongly suspect he doesn't that I don't want to waste my time.

But suppose we were to teach creationism. What would be the content of the teaching? Merely that a creator formed the universe and all species of life ready-made? Nothing more? No details?

If one thing goes without saying, almost anything can.

The Bible and science agree in being unable to say anything certainly about what happened before the beginning. There is this difference. The Bible will never be able to tell us. It has reached its final form, and it simply doesn't say. Science, on the other hand, is still developing, and the time may come when it can answer questions that, at present, it cannot.

There is no version of primeval history, preceding the discoveries of modern science, that is as rational and as inspiring as that of the first eleven chapters of the Book of Genesis.

Scientists have pushed back the horizon of time from the biblical 6,000 years to 4,600,000,000 years for the age of Earth a 760,000-fold increase.

We can hope that the ways of peace will attract the Arabic nations, for their territory and opportunities are broad enough for immeasurable advance, if the energies vented in spleen, are turned instead to a modernisation of the technology, a restoration of the soil, and a renovation of the economic, social, and political structure of those great and venerable lands.

It is by the Imperial Capital that contemporaries (and posterity, too) judge an Empire, and its magnificence impresses them mightily and leads them to judge the Emperor a great man and hero, even though it may all be based on robbery, and though the provinces of the Empire may be sunk in misery.

No matter how outrageous a lie may be, it will be accepted if stated loudly enough and often enough.

Religion is more conservative than any other aspect of human life.

In the world of today can there be peace anywhere until there is peace everywhere?

Generals are usually a conservative force who can be relied on to oppose social change.

Often, writers on historical events tend to consider ... a loss of willingness to fight as a sign of "decadence," as though there were something despicable about not being a bully and not being willing to engage in mass murder. Perhaps we ought to feel instead that to cease to be warlike means to begin to be civilized and decent.

476 ... is usually taken as the date of the "fall of the Roman Empire." The date, however, is a false one. No one at this period of time considered that the Roman Empire had "fallen." Indeed, it still existed and was the most powerful realm in Europe. Its capital was at Constantinople and the Emperor was Zeno. It is only because we ourselves are culturally descended from the Roman west, that we tend to ignore the continued existence of the Roman Empire in the east.

It is an odd fact that anyone who wishes to start a war must always make it appear that he is fighting in a just cause even if the real motive is naked aggression. Fortunately for the would-be aggressor, a "just cause" is very easy to find.

Probably, the most-often-repeated lesson in history is that foreigners who are called in to help one side in a civil war take over for themselves. It is a lesson that seems never to be learned despite endless repetition.

For man to become successful, for man to establish himself as the ruler of the planet, it was necessary for him to use his brain as something more than a device to make the daily routine of getting food and evading enemies a little more efficient. Man had to learn to control his environment.

Inspect every piece of pseudoscience and you will find a security blanket, a thumb to suck, a skirt to hold. What does the scientist have to offer in exchange? Uncertainty! Insecurity!

I recognize the necessity of animal experiments with my mind but not with my heart.

I consider one of the most important duties of any scientist the teaching of science to students and to the general public.

Throughout history there have been peasant rebellions which have followed always the same course. Blindly, the peasants sacked and destroyed, and when members of the "upper classes" fell into their hands, they killed ruthlessly and cruelly, for never in their lives had they been taught gentleness and mercy by those now in their power.

It seemed to him [Euphemius] it would be a brilliant notion to call in an outside force to fight on his behalf. This same brilliant notion has occurred to participants in civil wars uncounted times in history and it has ended in catastrophe just about every time, since those called in invariably take over for themselves. Of all history's lessons, this seems to be the plainest, and the most frequently ignored.

It is all too easy to forget that there are emotional motivations in history, as well as economic ones.

There has never been any custom, however useless it may become with changing conditions, that isn't clung to desperately simply because it is something old and familiar.

There is a kind of selective memory that afflicts men when they view the past. They see the good and overlook the evil.

It seems to be almost an invariable rule that as real power declines, the symbols of power multiply and intensify in compensation.

It is only afterward that a new idea seems reasonable. To begin with, it usually seems unreasonable.

It is the nature of science that answers automatically pose new and more subtle questions.

People who want to do so can lose weight most safely and permanently if they realize that above all they must be patient. ... It is better to eat a little less at each meal than impulse would suggest and to do that constantly. Add to this a little more exercise or activity than impulse suggests and keep that up constantly too. A few less calories taken in each day and a few more used up will decrease weight, slowly, to be sure, but without undue misery. And with better long-range results too.

The dullness of fact is the mother of fiction.

An observer studying the Solar system dispassionately, and finding himself capable of bringing the four giant planets to his notice, could reasonably say that the Solar system consisted of one star, four planets, and some traces of debris.

Outside intelligences, exploring the Solar System with true impartiality, would be quite likely to enter the Sun in their records thus: Star X, spectral class G0, 4 planets plus debris.

Predicting the future is a hopeless, thankless task, with ridicule to begin with and, all too often, scorn to end with.

Ten years on the moon could tell us more about the universe than a thousand years on the earth might be able to.

The fact that the general incidence of leukemia has doubled in the last two decades may be due, partly, to the increasing use of x-rays for numerous purposes. The incidence of leukemia in doctors, who are likely to be so exposed, is twice that of the general public. In radiologists the incidence is ten times greater.

By 1204, the only place where the entire body of Greek learning existed, still intact, was Constantinople. As a result of the crusaders' conquest, however, Constantinople was ruthlessly pillaged and destroyed and almost all the great treasures of ancient Greek learning were lost forever. It is because of that sack, for instance, that we have only seven plays left out of the better than one hundred written by Sophocles. The tragedy of 1204 can never be undone and for all of time, only bits and pieces of the marvelous Greek world can be known to us.

History is a story without an end.

Private profit is often hidden under a careful coating of great patriotism.

I don't believe in flying saucers... The energy requirements of interstellar travel are so great that it is inconceivable to me that any creatures piloting their ships across the vast depths of space would do so only in order to play games with us over a period of decades.

Start with a planet like the earth, with a complement of simple compounds bound to exist upon it, add the energy of a nearby sun, and you are bound to end with nucleic acids. You can't avoid it.

It is important to remember that the viciousness and wrongs of life stick out very plainly but that even at the worst times there is a great deal of goodness, kindness, and day-to-day decency that goes unnoticed and makes no headlines.

Indeed, it may well be argued that one reason for the decline in science, art, and literature was the increasing absorption of the better minds into a new sort of intellectual pursuit, theology.