Nothing interferes with my concentration. You could put on an orgy in my office and I wouldn't look up. Well, maybe once.

There is nothing frightening about an eternal dreamless sleep. Surely it is better than eternal torment in Hell and eternal boredom in Heaven.

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.

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

Experimentation is the least arrogant method of gaining knowledge. The experimenter humbly asks a question of nature.

Saying something is 'too bad' is easy. You say you disapprove, which makes you a nice person, and then you can go about your business and not be interested anymore. It's a lot worse than 'too bad.' It's against everything decent and natural.

Science doesn't purvey absolute truth. Science is a mechanism... for testing your thoughts against the universe.