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

In this sermon, the preacher emphasizes that Christ's death satisfied all the demands of God’s justice, making it complete and sufficient for salvation. Romans 5:9 states that believers are justified by His blood, ensuring that all who look to Him in faith are fully redeemed. The assurance of salvation rests on the authority of God Himself, who proclaimed that He is both just and a Savior. Thus, no one needs to add to the sufficiency of Christ's atoning work, as it is perfect and entirely sufficient for all whom He came to save.