There’s an old Native American story:

“On my shoulders are two wolves. One is a black wolf, evil, who continually tempts me to do and say the wrong things. On my other shoulder is a white wolf that continually encourages me to live up to my very best.”

A listener asked the man, “Which of these wolves has the greatest power over you?”

The old man replied, “The one I feed.”

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The Power of Self-Discipline
Brian Tracy