It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation..

Utopia was here at last: its novelty had not yet been assailed by the supreme enemy of a ll Utopias - boredom..

At the present rate of progress, it is almost impossible to imagine any technical feat that cannot be achieved - if it can be achieved at all - withi….

Absolutely no religious rites of any kind, relating to any religious faith, should be associated with my funeral..

No trilogy should have more than four books..

Every age has its dreams, its symbols of romance. Past generations were moved by the graceful power of the great windjammers, by the distant whistle ….

Moses Kaldor had always loved mountains; they made him feel nearer to the God whose nonexistence he still sometimes resented..

. . . Moon-Watcher felt the first faint twinges of a new and potent emotion. It was a vague and diffuse sense of envy--of dissatisfaction with his li….

In accordance with the terms of the Clarke-Asimov treaty, the second-best science writer dedicates this book to the second-best science-fiction write….

We stand now at the turning point between two eras. Behind us is a past to which we can never return... The coming of the rocket brought to an end a ….

Sometimes when I'm in a bookstore or library, I am overwhelmed by all the things that I do not know. Then I am seized by a powerful desire to read al….

Don't mess up the environment until you're quite sure what you're doing..

Creationism, perhaps the most pernicious of the intellectual perversions now afflicting the American public..

Before you become too entranced with gorgeous gadgets and mesmerizing video displays, let me remind you that information is not knowledge, knowledge ….

Across the gulf of centuries, the blind smile of Homer is turned upon our age. Along the echoing corridors of time, the roar of the rockets merges no….

Astronomy, as nothing else can do, teaches men humility..

Sometimes a decision has to be made by a single individual, who has the authority to enforce it. That's why you need a captain. You can't run a ship ….

I have never grown up, but I will never stop growing..

The best proof that there's intelligent life in the universe is that it hasn't come here..

But he knew well enough that any man in the right circumstances could be dehumanised by panic..

The Shuttle is to space flight what Lindbergh was to commercial aviation..