How do we know Christ's sufferings were necessary for salvation?

Christ's sufferings were not only necessary but foretold through the Scriptures. They are evidenced by multiple references in the New Testament that connect the Old Testament prophecies, such as those found in Psalm 69, to His reality on the cross. Hebrews 10 emphasizes that God prepared a body for Christ so He could offer Himself as the perfect sacrifice. As a surety for His people, He met all requirements of divine justice, bearing the wrath due for our sins, thereby establishing an eternal righteousness that affirms His essential role in our salvation.