No one suggests that writing about science will turn the entire world into a model of judgment and creative thought. It will be enough if they spread the knowledge as widely as possible.

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

There never can be a man so lost as one who is lost in the vast and intricate corridors of his own lonely mind, where none may reach and none may save.

Humanity is cutting down its forests, apparently oblivious to the fact that we may not be able to live without them.

To test a perfect theory with imperfect instruments did not impress the Greek philosophers as a valid way to gain knowledge.

Scientific truth is beyond loyalty and disloyalty.

Surely, if we take on thinking partners - or, at the least, thinking servants - in the form of machines, we will be more comfortable with them, and will relate to them more easily, if they are shaped like humans. It will be easier to be friends with human-shaped robots than with specialized machines of unrecognizable shape. And I sometimes think that, in the desperate straits of humanity today, we would be grateful to have nonhuman friends, even if they are only the friends we build ourselves.