"During the night, while Bull and Lucy slept, Edward, with ever-open eyes, stared up at the constellations. He said their names, and then he said the names of the people who loved him. He started with Abilene, and then went on to Nellie and Lawrence and from there to Bull and Lucy, and then he ended again with Abilene: Abilene, Nellie, Lawrence, Bull, Lucy, Abilene. See? Edward told Pellegrina. I am not like the princess. I know about love."

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Its more than a simple belief that there is good and that it should fight the evil in the world. It's a personification of Light and Darkness at their most elemental level, as forces that are so absorbed with themselves that one cannot exist without the other though they constantly try to consume one another. One of the earliest repersentations of Light and Darkness was of Light being a massive black bull and Darkness being an enormous white bull.

— P. C. Cast