How do we know that Christ saves his people?

The truth that Christ saves is rooted in His mission as outlined in Matthew 1:21, which says, "And she shall bring forth a son, and thou shalt call his name Jesus: for he shall save his people from their sins." Christ’s work of salvation is not arbitrary; it is specifically designed for those whom the Father has chosen, demonstrating the doctrine of election and the effectual call of God. His death was not only a sacrifice but a substitution for the elect, fulfilling the righteous demands of God's justice (Isaiah 53:5-6).