Two wolves

I know this isn't original, but I feel it bears repeating:

One evening a wise old man told his grandson about a battle that goes on inside people. He said, "My son, the battle is between two wolves inside us all. One is Evil. It is anger, envy, jealousy, sorrow, regret, greed, arrogance, self-pity, guilt, resentment, inferiority, lies, false pride, superiority, and ego. The other is Good. It is joy, peace, love, hope, serenity, humility, kindness, benevolence, empathy, generosity, truth, compassion and faith." The grandson thought about it for a minute and then asked his grandfather: "Which wolf wins?" The old man simply replied, "The one you feed."