It is one of the most common prayers of God’s child. “Lord, have mercy!” Mercy is the withholding of punishment or negative consequences that a guilty person deserves. Thus, when we pray, “Lord, have mercy,” 1) we are acknowledging that we have lived in ways deserving of God’s condemnation and punishment, and 2) we are begging God to not condemn or punish us. How important is that prayer? If you cannot say it with sincerity, you cannot be saved. For if you cannot speak that prayer, you cannot possibly believe you need a Savior. Therefore, God gave us his law, in part, so that we would see our need for mercy. St. Paul writes, “I would not have known what sin was had it not been for the law” (Romans 7:7). And God gave us the gospel that we might know he has shown us mercy.