Finally, I would like to assure my many Buddhist, Christian, Hindu, Jewish, and Muslim friends that I am sincerely happy that the religion which Chan….

The entire sweep of human history from the dark ages into the unknown future was considerably less important at the moment than the question of a cer….

God said, 'Cancel Program GENESIS.' The universe ceased to exist..

All human plans [are] subject to ruthless revision by Nature, or Fate, or whatever one preferred to call the powers behind the Universe..

People go through four stages before any revolutionary development: 1. It's nonsense, don't waste my time. 2. It's interesting, but not important. 3.….

When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossib….

If children have interests, then education happens..

I would defend the liberty of consenting adult creationists to practice whatever intellectual perversions they like in the privacy of their own homes….

I have great faith in optimism as a guiding principle, if only because it offers us the opportunity of creating a self-fulfilling prophecy..

I don't believe in God but I'm very interested in her..

Perhaps no other year before or since 1984 has been awaited with such eager anticipation..

I sometimes think that the universe is a machine designed for the perpetual astonishment of astronomers..

As our own species is in the process of proving, one cannot have superior science and inferior morals. The combination is unstable and self-destroyin….

The crossing of space ... may do much to turn men's minds outwards and away from their present tribal squabbles. In this sense, the rocket, far from ….

The piece of equipment I'm most found off is my telescope. The other night I had a superb view of the moon..

Now I'm a scientific expert; that means I know nothing about absolutely everything..

One can imagine a time when men who still inhabit organic bodies are regarded with pity by those who have passed on to an infinitely richer mode of e….

But please remember: this is only a work of fiction. The truth, as always, will be far stranger..

Guns are the crutches of the impotent..

There is a special sadness in achievement, in the knowledge that a long-desired goal has been attained at last, and that life must now be shaped towa….

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