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

In this single galaxy of ours there are eighty-seven thousand million suns. [...] In challenging it, you would be like ants attempting to label and classify all the grains of sand in all the deserts of the world. [...] It is a bitter thought, but you must face it. The planets you may one day possess. But the stars are not for man.

Science fiction seldom attempts to predict the future. More often than not, it tries to prevent the future.

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

Judge me by my deeds, though they are few, rather than my words, though they are many.

The West needs to relearn what the rest of the world has never forgotten - that there is nothing sinful in leisure as long as it does not degenerate into mere sloth.

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