How do we know that Christ's atoning sacrifice was sufficient?

In Romans 15:3, Paul reminds us that Christ did not please Himself but took on the reproaches that were due to us, highlighting His role as our substitute. Through His suffering and sacrificial death, He completely accomplished our salvation, fulfilling all righteousness demanded by God's law. Scriptures such as 2 Corinthians 5:21 confirm that Christ was made sin for us so that we might become the righteousness of God in Him. By His perfect obedience and subsequent sacrifice, Christ not only satisfied God's wrath but also established a new covenant through which believers are reconciled with God and declared righteous. The sufficiency of His atonement is further affirmed through the resurrection, which demonstrates God's acceptance of Christ's sacrifice.