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" According to my grandmother’s people, two wolves live inside every creature: one evil and the other good. They spend all their time trying to destroy each other.” It was, Matthew thought, as good a description of blood rage as he was ever likely to hear from someone not afflicted with the disease. “My bad wolf is winning.” Jack looked sad. “He doesn’t have to,” Chris promised. “Nana Bets said the wolf who wins is the wolf you feed. The evil wolf feeds on anger, guilt, sorrow, lies, and regret. The good wolf needs a diet of love and honesty, spiced up with big spoonfuls of compassion and faith. So if you want the good wolf to win, you’re going to have to starve the other one. "
― Deborah Harkness , The Book of Life (All Souls, #3)