How do we know that God's grace is sufficient for the worst of sinners?

In the narrative of Saul of Tarsus, we see a man who was vehemently against the church, yet God’s grace intervened and transformed him into Paul, one of Christianity’s greatest apostles (Acts 9:1-19). Similarly, Manasseh, a king known for his evil deeds, repented and was restored after he sought God during his captivity (2 Chronicles 33:12-13). These accounts serve as powerful testimonies to the fact that no one is beyond the reach of God's grace, illustrating the truth that God's grace is indeed sufficient for the worst of sinners.