The way which leads to God is Christ, the theme of Part III. It can be asserted that the incarnation was absolutely necessary. The "Unio" between the Logos and the human nature is a "relation" between the divine and the human nature, which comes about by both natures being brought together in the one person of the Logos. An incarnation can be spoken of only in the sense that the human nature began to be in the eternal hypostasis of the divine nature. So Christ is "unum" since his human nature lacks the hypostasis.