How do we know Jesus' sacrifice was sufficient for salvation?

The sufficiency of Jesus' sacrifice for salvation is rooted in His dual nature as fully God and fully man. As the God-man, He possessed the infinite worth necessary to atone for the sins of millions (Matthew 1:23). The concept of substitutionary atonement illustrates that only a perfect sacrifice could satisfy God's requirement for justice due to humanity's sinfulness (Hebrews 10:12). The resurrection of Christ serves as the ultimate proof that His sacrifice was accepted by the Father, signaling the victory over sin and death (1 Corinthians 15:55-57). Thus, those who believe in Him are justified by faith and assured of their salvation.