i-living-islam:

An old man told his son about a battle that goes on inside people. He said, “Son, there is a battle between two wolves inside us all. One is evil - it is anger, envy, jealousy, sorrow, regret, greed, guilt, lies & ego. The other one is good - it is joy, peace, love, serenity, humanity, kindness, faith, compassion, truth & hope.” The son asked his father, “Which wolf wins?” The old man replied, “The one you feed.”