How do we know that Christ's sacrifice is sufficient for our salvation?

Hebrews 10 explicates that Christ offered one sacrifice for sins forever and then sat down at the right hand of God, indicating His work is completed and accepted by the Father. This seating affirms that there are no further sacrifices required for redemption. Additionally, Scripture indicates that men, when striving for their own righteousness through works, are unaware they are adding to their sin instead of obtaining true forgiveness. Christ’s sacrifice alone is sufficient because it fulfills the Law's demands, unlike the continual offerings that could not remove sin. Thus, believers rest assured in the one true sacrifice that is entirely sufficient.