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 - within the next few hundred years.

And because, in all the Galaxy, they had found nothing more precious than Mind, they encouraged its dawning everywhere. They became farmers in the fields of stars; they sowed, and sometimes they reaped. And sometimes, dispassionately, they had to weed.

There is the possibility that humankind can outgrow its infantile tendencies, as I suggested in 'Childhood's End.' But it is amazing how childishly gullible humans are.

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

Humor was the enemy of desire.

The difference between machines and human beings is that human beings can be reproduced by unskilled labour.

Isn't killing people in the name of God a pretty good definition of insanity?