As one gets older and more rickety, and as medical technology advances, doctors love to play with their toys, using you as their victim. I. Asimov: A Memoir (1994)
Writing is hard work. The fact that I love doing it doesn't make it less hard work. In Joy Still Felt (1980)
It is the invariable lesson to humanity that distance in time, and in space as well, lends focus. It is not recorded, incidentally, that the lesson has ever been permanently learned. The Foundation series (1951)
If you were to insist I was a robot, you might not consider me capable of love in some mystic human sense, but you would not be able to distinguish my reactions from that which you would call love — so what difference would it make? The Foundation series (1951)