How do we know God will forgive us like He forgave Nineveh?

The assurance of God's forgiveness is rooted in His character and the redemptive work of Jesus Christ. In Jonah's account, we see a powerful illustration of how a humble recognition of sin and a sincere plea for mercy can lead to divine forgiveness. God does not desire the death of the wicked but rather that they turn from their wicked ways and live. This theme is echoed in the New Testament, where Jesus' atonement secures forgiveness for all who believe in Him. The permanence of Christ's completed work on the cross assures us that anyone who turns to God in faith will find Him merciful and gracious; thus, we can rest on His promise of pardon.