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

The sufficiency of Christ's work for redemption is grounded in the perfection of His sacrifice. As the ultimate high priest, Christ entered the heavenly sanctuary with His own blood, providing a complete and perfect atonement for the sins of His people. Hebrews 7:21 tells us that Christ's priesthood is established with an oath, signifying the unchangeable nature of His redemptive work. He paid the full price for sin, securing forgiveness and purchasing eternal life for every chosen sinner, which is the essence of the gospel message.