“In twenty thousand years,” said Daneel, “no one has guessed I was a robot when it was not my intention to have him or her know. In part, that was because human beings abandoned robots so long ago that very few remember that they even existed at one time. And in part, it is because I do have the ability to detect and affect human emotion. The detection offers no trouble, but to affect emotion is difficult for me for reasons having to do with my robotic nature—although I can do it when I wish. I have the ability but must deal with my will not to use it. I try never to interfere except when I
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