I am not a speed reader. I am a speed understander.

Any teacher that can be replaced by a computer should be replaced by a computer.

I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.

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

In life, unlike chess, the game continues after checkmate.

And in man is a three-pound brain which, as far as we know, is the most complex and orderly arrangement of matter in the universe.

The energy requirements for interstellar travel are so great that it is inconceivable to me that any creatures piloting their ships across the vast depths of space would do so only in order to play games with us over a period of decades. If they want to make contact, they would make contact; if not, they would save their energy and go elsewhere.