Personality then is the synthetic principle in man's being. Psychology reveals it as unifying the parts of a man's soul and welding into an indivisible whole the various elements of conscious and subconscious experience. The student of Christology welcomes this account of personality, but he requires more. He seeks a parallel for the union of two whole and perfect natures. He demands some reason for holding the central dogma of the incarnation to be intelligible and probable. The next step in the argument accordingly is to ask, "Why limit the synthetic power of personality?" If personality can synthesise parts of a nature, why should it not also synthesise natures? If human personality can unify such heterogeneous psychic elements as thought, will and feeling, and present them as a harmonious whole, is it not credible that divine personality should carry the synthesis a step further and harmonise in one being the thoughts, wills and feelings of God and man? The hypostatic union of natures in Christ is a phenomenon not psychologically improbable, and one which can be paralleled from human experience. There is in man what is tantamount to a conjunction of the two natures. Man is rather diphysite than monophysite. We pointed out above the extensive modifications that can be produced in a man's nature by environment. There is in him a deeper duality which we can only characterise as an association of divine and human. Man is an inhabitant of the earth, of earthly descent and finite destiny; yet the divine is not totally foreign to him. He has hopes of heaven, moments of supraconsciousness, at times vision, resolve and emotion that are supra-normal. The divine is an element in him. It is more than an aspect of his nature. Its influence operates often in opposition to the human element. He is, as Bergson puts it, at the meeting-point of the upward and the downward currents. He can know God, can do the will of God, can be filled with the love of God. Here are the three factors of his nature, raised to a higher power. His experience may lie and often does lie on two planes. He is "double lived in regions new."