The Old Sioux
One evening an old Sioux told his grandson about a battle that goes on inside people. He said "My Son, that battle is between two 'wolves' inside us all. One is Evil. It is anger, fear, 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 Sioux simply replied "The one you feed"