Two Natures, One Person - Westminster Confession 8.2-3

The central question about Jesus while he was alive and ever since is, “Who is he?” He himself asked his disciple, “Who do men say that I am? Who do you say that I am?” He is the only Redeemer. He is the Lord Jesus Christ. And he is Redeemer and Lord because he is the eternal Son of God who at a particular time in history in the womb of the Virgin Mary took on a human nature. Jesus is fully God and fully man and yet a single Person. The Christian Church at the Council of Chalcedon in 451 A.D. stated this teaching of Jesus about himself clearly and forcefully, and all orthodox churches endorse it. Jesus had to be both divine and human in order to be the mediator between God and man. He is our high priest who can sympathize with our weaknesses. And he is God who is able to save. The union between the divine and human is so indissoluble in Jesus that the Bible sometimes attributes what can only be true of one nature to the other, as in Acts 20:28 which refers to “the church of God which he purchased with his own blood,” or John 6:62, “What then if you should see the Son of Man ascend where he was before?” Anyone who acknowledges that Jesus Christ has come in the flesh (I Jo 4:2) must logically be a Christian.