Personality differs from nature also in respect of relation to environment. It is relatively independent of circumstances. Habit and education mould the nature, but if they touch the person they do so only indirectly. The nature must be deeply affected before a change in the person is registered. Personality is not synonomous with inherited disposition; but it bears a similar relation to nature as inherited disposition does to acquired habit. It is to nature what character is to action. It is to nature what in Weismann's theory the germ plasm is to the somatic cell. Changes in it are mediated by nature and are almost imperceptible in a life time.
Again, nature is the superficies of the soul. It is the part that comes in contact with the world of things and people. A man's nature is what he is for other people; what he is in and for himself alone is personality. There is a substance or self-existence of the psychic states. Thought, will and feeling have all and each an external reference. The internal reference of the whole is the core of being. Our perception of personality in other people is a subtle thing. In the ordinary give and take of life we are not aware of it. It is when we realise the subject as a self-existent unity that we recognise personality. We judge a man's nature by his thought or will or feelings as conveyed through the ordinary channels of communication. Personality is felt. It is a magnetism that influences, but remains inarticulate.
Person and nature differ also in respect of relation to the body. The co-existence of heterogeneous natures in the same body is a fact of experience. Different universes of thought, different levels of will and feeling can be lodged in one organism. The higher the development of the individual, the more clearly marked is the duality or plurality of nature. It is otherwise with personality. In normal cases no two personalities can tenant the one body. The unity of the organism is the outward expression and guarantee of the unity of the person. There are of course pathological cases which form exceptions to this rule. Such cases, however, only serve to emphasise the distinction between person and nature. In cases of dual personality the occupancy of the one body is not simultaneous. Jekyll alternates with Hyde. Dual personality is a totally different phenomenon from duality of nature. Duality of nature is relatively superficial. In dual personality the divergence in mental and moral outlook is so radical that responsibility for the acts of the one entity cannot attach to the other entity.
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."
In applying this human analogy to the ideal man caution is necessary. The duality of natures is a fact in both cases, but there is one essential difference. The personal substratum of the natures in one case is human, in the other case divine. In man the divine element is part of his nature, but not part of his person. The ego remains human through all spiritual development. "The best of saints is a saint at the best." The secondary element in him is a fact, but it is part of his nature, not of his person. It is otherwise in the case of Christ. He came from the ideal world and returned there. The background of his experience was and is divine. The secondary element in Him was the human, the primary the divine. He shared man's experience and shared it really, but it did not form part of the core of His being. When He thought or willed or felt as a man, it was a kénôsis, a limiting of his natural mode of self-expression. Divine and human are both present in the experience of Christ and of mankind, but with this difference—man rises to the divine; Christ condescended to the human.
VALUE OF BERGSON'S PSYCHOLOGY TO ORTHODOX CHRISTOLOGY
Person and nature are then real and distinct psychic entities. They are real alike in God and man. The distinction between them is not artificial or verbal; it is perhaps elusive, but it is genuine and capable of proof from experience. The synthetic faculty of personality manifests itself in uniting without confusing, first, parts of the nature, second, entire natures. These theses supply what is requisite for an intelligent appreciation of Christology. Without them Christology is a battle of shadows; with them it becomes a practical problem of first importance for religious minds. The psychology which justifies orthodox Christology is that which proclaims the interpenetration of psychic states, and which distinguishes between the surface states of a relaxed consciousness, and the deep-seated states which are ever present, but of which we are conscious only at moments of tension.
The catholic mind conceives the person of Christ as an eternal self-existent synthetic unity that has combined in an indissoluble union the natures of God and man. Human parallels make intelligible the co-existence of the two natures in the one person and the one body. What is normal in man is surely possible in the ideal man. Heretical Christologies err in their psychology. In Nestorian Christology Christ is presented as a dual personality, an abnormal association in one body of two distinct self-existent beings. Thus a pathological case would be elevated to the rank of mankind's ideal. The monophysite psychology plunges men into the opposite error. An undiscriminating craving for unity among the phenomena of psychic life prevents any recognition of the dual character of experience. Monophysitism is blind to the difference between person and nature because it places all psychic experiences on the one level. Determined to find unity in its ideal, it seeks an inappropriate unity, the mathematical unity, the unity that excludes plurality. To the monophysite the major part of the gospels is a sealed book, because the major part of the facts there recorded about Christ could not possibly have happened to a one-natured Christ. His human knowledge, normal, limited, progressive, His human will, natural, adequate to the human, inadequate to the superhuman task, his human feelings, his body consubstantial with ours are to the monophysite merely shadows or symbols or aspects of something greater. They are dwarfed into nothingness. They are lost in the divine omniscience, omnipotence and transcendent love.