How do we know that Jesus is both God and man?

Frank Tate emphasizes in his sermon that Jesus Christ is fully God and fully man—this is foundational to biblical salvation. He must be God in order to satisfy divine justice and man to represent humanity in His atoning death. References to this can be found in Romans and Galatians, where the uniqueness of Christ's nature is affirmed. As a man, He can suffer and die for our sins, while as God, He has the authority and power to redeem sinners. This heavenly arithmetic is crucial for understanding how Christ can both bear the weight of our sins and restore a right relationship with God.