How do we know that Jesus' sacrifice is sufficient for salvation?

We understand the sufficiency of Jesus' sacrifice through Scripture, which affirms that His death on the cross fully satisfies the demands of God's law. In Ephesians 1:7, it is declared that 'in Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace.' This highlights that Jesus' sacrifice was not only adequate but abundantly sufficient to atone for the sins of His elect. Additionally, His resurrection validates the effectiveness of His sacrifice, proving that He conquered sin and death. The Old Testament foreshadowed this through the sacrificial system, which ultimately points to Christ as the Lamb without blemish, articulating that He is the only means through which we can be reconciled to God.