Trinity and Incarnation belong together. The doctrine of the Trinity declares that the man Jesus is truly divine; that of the Incarnation declares that the divine Jesus is truly human. Together they proclaim the full reality of the Savior whom the New Testament sets forth, the Son who came from the Father’s side at the Father’s will to become the sinner’s substitute on the cross (Matt. 20:28; 26:36–46; John 1:29; 3:13–17; Rom. 5:8; 8:32; 2 Cor. 5:19–21; 8:9; Phil. 2:5–8).

J. I. Packer