Do we "feed" the negative or positive in us?

Many of us know that positive thoughts in us attract positive energy towards us, sometimes referred to as The Law of Attraction. God's Word instructs us to think on Himself and what is positive in us and in our lives. One verse, amongst many, is "You will keep in perfect peace those whose minds are steadfast because they trust in you" (Isaiah 26:3). An old Cherokee fable likens the positive and negative in us to two wolves which are at war within each of us. Which one are we feeding?