How do we know Christ's redemption is sufficient for salvation?

The sufficiency of Christ's redemption is grounded in His perfect sacrifice, which meets all the demands of God's holy law. In Isaiah 63:5, the Lord declares that no one but Himself could bring salvation, emphasizing that our works cannot redeem us. Furthermore, Hebrews 10 explains that the Old Testament sacrifices were merely shadows of the reality found in Christ, who is the ultimate sacrifice that actually takes away sin. This assurance is reinforced in John 10:28-29, where Jesus ensures that all whom He redeems shall never perish, affirming the efficacy of His work for His people.