What does the Bible say about asking God for mercy?

Scripture captures the essence of a sinner's dependency on God, as illustrated in Psalm 20. This psalm is a collective prayer where the Church pleads with God for mercy, echoing the sentiment of 'Save, Lord.' It highlights the fact that recognizing oneself as a sinner leads to a constant need for grace. The act of asking God for mercy is not merely a one-time event but a continual posture of the believer, as seen in the life of David and exemplified by Christ's own petitions in times of trouble.