He said to them, “A fight is going on inside me, it is a terrible fight and it is between two wolves. One wolf is evil – he is fear, anger, envy, sorrow, regret, greed, arrogance, self-pity, guilt, resentment, inferiority, lies, false pride, competition, superiority, and ego.
“The other is good – he is joy, peace, love, hope, sharing, serenity, humility, kindness, benevolence, friendship, empathy, generosity, truth, compassion and faith. This same fight is going on inside you, and inside every other person, too.”
They though about it for a minute and then one child asked his grandfather, “Which wolf will win?”
From The Impeccable Warrior of Light, by Peace Mother Geeta.
"Watch over your heart with all diligence, For from it flow the springs of life."