How do we know grace is enough for salvation?

Romans 5:20 states that where sin abounded, grace did much more abound, reinforcing the sufficiency of God's grace in salvation. It highlights that despite the depth of our sinfulness, God's grace is more than adequate to cover and forgive all our sins. This grace is not only sufficient but also is the very means through which God justifies the ungodly and reconciles them to Himself. Therefore, the assurance of salvation rests not on our deeds, but solely on the unfathomable grace that flows from God through Jesus Christ.