Parable: Parable. Two wolves

Once upon a time the old Indian opened his grandson one vital truth.
In every person there is a struggle, much like the struggle between two wolves. One wolf is evil - envy, jealousy, sorrow, selfishness, ambition, lies... the Other wolf is good - peace, love, hope, truth, kindness, loyalty...
Little Indian, touched to the core words of his grandfather, for a few moments thought, and then asked: - And what a wolf at the end wins?
Old Indian barely perceptible smile and replied:
- Always wins the wolf that you feed.