How important is it for you to be pure? How important is it for you to be righteous? For David, who had experienced the elation of sharing an intimate holy relationship with God and the utter pain of miserably failing God, guarding his heart was of ultimate importance. He didn't want to have any part of evil. He didn't want to be attracted to it. He didn't want to be a part of those who committed vile deeds. He didn't even want to take part in the luxuries and feasts. What are we willing to ask God to withhold from us to keep us from evil?