How do we know that God's grace is sufficient for reconciliation?

The sufficiency of God's grace for reconciliation is evident through His provision of Jesus Christ as the ultimate sacrifice for our sins. As stated in 2 Corinthians 5:18-19, God was in Christ reconciling the world unto Himself, implying an undeniable commitment to restore His people. Furthermore, in Titus 3:5-6, we see that our salvation is not based on our works but on God's mercy, which is perhaps the clearest indication of grace's sufficiency. God's initiative to seek and save the lost demonstrates that reconciliation is entirely rooted in His will and purpose, not dependent on human merit. Thus, all who trust in Christ can be assured of their reconciled status with God.