What Goes Around... Comes Around
"Bumper stickers saying WITCHES HEAL were all the rage, and if you asked anybody about using magic to harm somebody else you could pretty much count on getting a lecture on the threefold law of return—the once-widespread Neopagan belief that whatever you do, for good or ill, circles back to you like a boomerang and gives you back three times the good or ill you sent out." -John Michael Greer