... you just can't differentiate between a robot and the very best of humans.

Radiation, unlike smoking, drinking, and overeating, gives no pleasure, so the possible victims object.

Never let your sense of morals get in the way of doing what's right.

During the century after Newton, it was still possible for a man of unusual attainments to master all fields of scientific knowledge. But by 1800, this had become entirely impracticable.

[Social] science fiction is that branch of literature which is concerned with the impact of scientific advance on human beings.

To bring about destruction by overcrowding, mass starvation, anarchy, the destruction of our most cherished values, there is no need to do anything. We need only do nothing except what comes naturally, and breed. And how easy it is to do nothing

The fall of Empire, gentlemen, is a massive thing, however, and not easily fought. It is dictated by a rising bureaucracy, a receding initiative, a freezing of caste, a damming of curiosity — a hundred other factors. It has been going on, as I have said, for centuries, and it is too majestic and massive a movement to stop.