How do we know that God will have mercy on sinners?

Isaiah 55:7 assures us that, 'He will have mercy upon him.' This promise stands as a testament to God's character—gracious and merciful, as stated in Micah 7:18. The abundant mercy of God is not only an abstract theological concept but is demonstrated in His willingness to forgive all types of sins for those who turn to Him in faith. The narrative of the thief on the cross exemplifies this mercy, where Jesus assures him of paradise upon his repentance. Therefore, knowing His grace is for sinners underlines the gospel message: that those who recognize their need and call upon the Lord will find mercy and salvation.