How do we know that God's mercy is sufficient for sinners?

The narrative of the publican in Luke 18 serves as a powerful reminder of God's abundant mercy. The publican approaches God with nothing but a humble heart, recognizing his need for mercy, and God, who is merciful and gracious, responds favorably. In Hebrews 2:17, we see that Christ became a merciful high priest, capable of making reconciliation for the sins of His people. This illustrates that God's mercy is not only theoretical but is mediated through Christ's sacrifice. Additionally, passages like Micah 7:18 affirm God's delight in showing mercy, emphasizing His readiness to pardon those who call upon Him in faith, confirming that mercy is indeed sufficient for even the greatest of sinners.