How do we know that Christ's death accomplished our salvation?

We can be assured of the efficacy of Christ's death through the clear testimony of Romans 5, which states that we are 'justified by His blood.' This suggests that Christ's sacrifice was not a potential salvation but rather an actual one, fulfilling God's plan for redemption. His work on the cross reconciled sinners to God, highlighting that our reconciliation does not depend on our merit or actions, but solely on Christ's completed work. This assurance is reinforced by emphasizing that it was during our state as enemies that we were reconciled by His death, indicating that His sacrificial love was fully effective.