How do we know that Christ's sacrifice for sins is enough?

1 Peter 3:18 declares that Christ suffered once for sins, the just for the unjust, ensuring our reconciliation with God. This sufficiency is emphasized in Hebrews 10:12, which states Christ offered one sacrifice for sins forever. The notion that His sacrifice needs to be supplemented by our works or faith is a lie, as it undermines the completeness of His atonement. Christ’s sacrifice addressed all the demands of God’s justice on behalf of His people and ensures that those for whom He died are fully provided for in salvation. It is essential that we understand the full implications of substitutionary atonement in the context of the gospel.