How do we know Christ is essential for salvation?

In the framework of sovereign grace theology, our assurance of Christ's essentiality for salvation is grounded in Scripture, which makes it clear that He is both our Savior and the fulfillment of God’s redemptive plan. As emphasized in the sermon's exposition on John 15, without Christ, we can do nothing; He is depicted as the true vine, highlighting our dependence on Him for spiritual fruitfulness. This dependence reveals that any hope of redemption, forgiveness of sins, and reconciliation with God comes solely through Christ’s accomplished work on the cross. Moreover, our acknowledgment of Christ as our righteousness ensures we cannot claim any merit of our own, but must rely completely on His perfect sacrifice.