The first step in making rabbit stew is catching the rabbit.

I don't believe in personal immortality; the only way I expect to have some version of such a thing is through my books.

There is no merit to discipline under ideal circumstances. I must have it in the face of death or it is worthless.

Nonsense! The most hopelessly stupid man is he who is not aware that he is wise.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

The temptation was great to muster what force we could and put up a fight. It's the easiest way out, and the most satisfactory to self-respect--but, nearly invariably, the stupidest.

Whenever I have endured or accomplished some difficult task -- such as watching television, going out socially or sleeping -- I always look forward to rewarding myself with the small pleasure of getting back to my typewriter and writing something.