How do we know Christ's atonement is sufficient for salvation?

The sufficiency of Christ's atonement is rooted in the understanding that He was not merely a Levitical priest entering a physical tabernacle but the Son of God. According to Hebrews 9:12, Christ entered the holy place with His own blood, having obtained eternal redemption for us. Unlike the sacrifices of bulls and goats, which could never take away sins, His sacrifice was perfect and final. It signifies that He bore the iniquities of the elect, ensuring that those for whom He died can stand justified before God. This accomplishment of eternal redemption emphasizes that through faith in His blood, believers are granted righteousness and sanctification, affirming the wealth of Christ's sacrificial work.