“It looked at Ransom in silence and at last began to smile. We have all often spoken – Ransom himself had often spoken – of a devilish smile. Now he realized that he had never taken the words seriously. The smile was not bitter, nor raging, nor, in an ordinary sense, sinister; It was not even mocking. It seemed to summon Ransom, with a horrible naïveté of welcome, into the world of its own pleasures, as if all men were at one in those pleasures, as if they were the most natural thing in the world and no dispute could ever have occurred about them. It was not furtive, nor ashamed, it had nothing of the conspirator in it. It did not defy goodness, it ignored it to the point of annihilation. Ransom perceived that he had never before seen anything but half-hearted and uneasy attempts at evil. This creature was whole-hearted. The extremity of its evil had passed beyond all struggle into some state which bore a horrible similarity to innocence. It was beyond vice as the Lady was beyond virtue.”
C.S. Lewis Perelandra [it being a devil who has possessed the body of the late scientist Edward Rolles Weston]