How do we know Christ's sacrifice is effective for salvation?

The sermon discusses that Christ's sacrificial death was specifically for the elect, as stated in Romans 5:8. This scripture reveals that while we were yet sinners, Christ died for us, indicating that His death was intended to save a particular people. Furthermore, Christ's mission to make an end of sins emphasizes the fulfillment of God's redemptive plan, securing salvation for those He has chosen. The assurance of faith believers hold arises from understanding that Christ's work at the cross was precisely for them, affirming the effectiveness of His sacrifice.