How do we know that Christ must save His people?

The conviction that Christ must save His people arises from the sovereign will and decree of God. Scriptures affirm that all whom the Father gives to the Son will be saved, and Jesus assures us that He will not lose any of them (John 6:39). This underscores the certainty of salvation for the elect, rooted in God’s eternal purpose. God’s interaction with humanity is marked by His gracious plan to redeem a people for Himself, epitomized through the coming of Christ, who fulfills the promise made in Genesis about the seed that would crush the serpent’s head. Therefore, our assurance lies in the unchanging counsel of God and the accomplishment of Christ's work.