How do we know Christ's sacrificial death is sufficient for our salvation?

The sufficiency of Christ's sacrificial death is rooted in Scripture and is a core tenet of Reformed theology. In Revelation 5:9, we see that Christ's blood has redeemed people from every tribe and nation, illustrating that His death was not just a potential salvation but an actual atonement for His elect. Additionally, the assurance of this sufficiency is affirmed by the fact that His sacrifice satisfies God's justice, as noted in the sermon when the preacher reflects on Christ as the Lamb of God who is worthy to receive honor. If Christ's death did not secure the salvation of even one for whom He died, His sacrifice would be rendered ineffective. However, the truth testified in Scripture proclaims that all for whom He laid down His life will be brought to faith and ultimately saved. This understanding assures believers of their eternal security in Him.