Psalm 6:1 begins with O Lord, do not rebuke me in your anger or discipline me in your wrath. David was not perfect and at times he knew he deserved God’s punishment. But he still requested God’s mercy. While God requires justice and judgement for sin, He is also loving and merciful in His correction of us in our sin. Through Christ God expressed His loving kindness in His forgiveness of our sin instead of giving us what we really deserve.