The one you feed.

One evening, an old Cherokee 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, greed, and arrogance. The other is Good - It is peace, love, hope, humility, compassion, and faith."

The grandson thought about this for a while and then asked his grandfather, "Which wolf wins?"

To which the old Cherokee simply replied, "The one you feed."

It wasn't that hard, don't you think?