Our hearts are nourished by joy. As our physical being benefits from healthy food, so our spiritual being benefits from joy. We are all aware of how the body suffers when we consume junk food. Junk food for the heart is resentment, bitterness, envy and fear. We are wise to protect ourselves from them. When we can see clearly the benefits of consuming that which is truly nourishing, and the disadvantage of indulging in that which is harmful, we will naturally incline towards the wholesome.