If the stars must someday die, at least some could yet be built. - Isaac Asimov

A robot, by its very nature, cannot bear to fail its function.

At least once every human should have to run for his life, to teach him that milk does not come from supermarkets, that safety does not come from policemen, that “news” is not something that happens to other people. He might learn how his ancestors lived and that he himself is no different — in the crunch his life depends on his agility, alertness, and personal resourcefulness.

Now any dogma, based primarily on faith and emotionalism, is a dangerous weapon to use on others, since it is almost impossible to guarantee that the weapon will never be turned on the user.