How do we know the suffering of Christ was necessary for our salvation?

Christ's suffering was not arbitrary but a fulfillment of God's righteous requirement for sin. Psalm 22 illustrates that there was a divine purpose in the agony that Christ endured. The necessity of His suffering lies in the requirement that justice must be satisfied for sin; thus, Christ took upon Himself the punishment meant for His people. This principle is rooted in the holiness of God, who must uphold justice, and the love of God, who desires to redeem His chosen. As a result, believers find assurance in knowing that their salvation was bought with a price—one that was paid through the sacrificial suffering of Christ.