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

The doctrine of the two natures of Christ—fully God and fully man—is essential to understanding the incarnation. Paul refers to this as a great mystery in 1 Timothy 3:16, where he states, "God was manifest in the flesh." This indicates that the second person of the Godhead united with human nature while remaining divine. The virgin birth, through the power of the Holy Spirit, ensured that Christ was without sin and truly human, while also being divine—a unique aspect of sovereign grace theology that highlights the necessity of both natures for our redemption.