What does the Bible say about mourning over sin?

Mourning over sin is addressed in various parts of Scripture, most notably in the Beatitudes where Jesus states, 'Blessed are those who mourn, for they shall be comforted' (Matthew 5:4). This mourning is not merely a sorrow for the consequences of sin, but a heartfelt acknowledgment of the sin itself. The believer understands that their sins are an offense against a holy God, and this realization fosters a deep sorrow. David, in Psalm 119, expresses this sentiment, indicating that his soul 'melteth for heaviness' due to his sin. It emphasizes that true mourning comes from the indwelling conviction of the Holy Spirit and leads to repentance and ultimately comfort in Christ's redemptive work.