The Incarnation teaches that the eternal Word, the second person of the Trinity, took unto himself a human nature and became man without in any way diminishing his deity (cf. John 1:1, 14, 18; Philippians 2:5–6; Colossians 2:9; 1 John 4:1–3). Christian orthodoxy therefore views Jesus Christ as a single person who, nevertheless, possesses both a divine and a human nature. Those two natures find their union in the person of Christ (called the hypostatic union). This theological understanding of the Incarnation led the ancient Christians to refer to Jesus as the theanthropos (Greek: the “God-man”).