How do we know Christ's work for salvation is true?

The truth of Christ's work for salvation is grounded in His fulfillment of the law and the prophetic Scriptures. In Psalm 40:7-8, Christ declares His willingness to come and do the will of the Father to save His people. His life, death, and resurrection were foretold, demonstrating that He is the promised Messiah who perfectly satisfied God's holiness. The New Testament affirms this truth, showcasing Christ as the Lamb who takes away the sin of the world (John 1:29), solidifying that salvation is indeed secured in Him and not based on human merit, but rather through divine grace.