What demon possessed me that I behaved so well?

The world is, was, will always be filled with good and evil, because good and evil is the yin and yang of the human condition. It tells me something else. If you remember, God's favorite angel was Lucifer. Apparently, Lucifer means "the light." It also means "the morning star," in some scripture. And apparently, he disobeyed God, and that's the ultimate disobedience to authority. And when he did, Michael, the archangel, was sent to kick him out of heaven along with the other fallen angels. And so Lucifer descends into hell, becomes Satan, becomes the devil, and the force of evil in the universe begins.