Is the Son Inferior?

The Bible teaches that the Son of God, according to His human nature, is in fact inferior to God. And that must be the case, since how could the Son of God identify with us, substitute for us, or represent us, unless He assumes a human nature, which is inferior to God? The ancient creeds recognize this fact.
Is the Son of God inferior to God? The answer to this question, after the incarnation, is both “yes and no.” The Son of God is indeed inferior to God, according to His assumed human nature, but He is not inferior to God, according to His divine nature. To understand this answer, it is necessary to understand that the incarnate Son of God has two natures, a true divine nature and a true human nature, united in the one person of the Son of God. At the incarnation, the eternal Son of God took to Himself a true human nature. In theology, this union of Christ’s two natures in one person is called the “hypostatic union” which refers to a “personal union” of true God and true man.
The Hypostatic Union
Consider the hypostatic union in a bit more detail. The term “hypostatic” is from a Greek word, hupostasis, or person, and refers to the manner in which a rational nature subsists. The term “person,” according to Boethius, refers to “an individual substance of a rational nature.”[1] Others have defined it as “subsistence endowed with reason.”[2] “In general, ‘person,’ is defined as a substance, or individual nature, endowed with intelligence, subsisting by itself, really and truly distinguished from others by its own incommunicable property.”[3]
To understand the hypostatic union, it is necessary to reflect on the terms “nature” and “person.” The difference between a rational nature and a person is that a person refers to the particular way in which a rational nature acts. Rational natures do not act. Only persons act. Or to put it differently, rational natures subsist as particular persons, which act distinctively within and by those natures.
Consider three examples of rational natures that subsist as persons: God, angels, and human beings. God’s being is rational, and His nature exists in three ways, persons, or subsistences: the Father is neither begotten nor proceeding, the Son is eternally begotten from the Father, and the Spirit is eternally proceeding from the Father and the Son. Angels also have a rational nature, and each individual angel subsists as a particular person, or way of being and acting as an angel. Each human being also has a rational nature, and each individual human being exists as a particular person, or way of acting as a human.
This brings us to the Lord Jesus Christ. At the incarnation, the eternal person of the Son of God assumed a human nature. The eternal Son of God is nothing other than the very being of God subsisting personally, and thus at the incarnation, the whole divine essence, subsisting in the manner of the Son, joined Himself to a human nature. The Bible speaks of the incarnation of the Son of God in various ways. It says “the Word became flesh” (Jn 1:14), “came in the flesh” (1 Jn 4:2-3), “took the form of a servant” (Phil 2:7), was made a “partaker of flesh and blood” (Heb 2:14), and was “manifested in the flesh” (1 Tim 3:16).
But how are the divine and human natures united in Christ? What sort of union is it? It is not an essential union, in which the two essences are blended together. It is not a covenantal union, such that the two natures simply agree together. It is not a natural union as in the union of the human body and the soul. It is not an external union, like the union of God with the angel of the Lord, or of angels to their bodily manifestations. Rather it is a true personal union.
But what is meant by personal union? The great Reformed theologian, Francis Turretin helpfully describes the personal union of Christ’s two natures. He said that God the Son (the divine nature subsisting) assumed to Himself a human nature, which does not subsist in the manner of a human person. It is crucial to grasp that the human nature of Christ is not a human person and has no personal subsistence of its own. If the human nature subsisted, it would be a human person, not a divine person. If it is claimed that the human nature subsisted as the Son of God, then the human nature would subsist as God, which is impossible because the finite cannot grasp or contain the infinite. Rather, Christ’s human nature, a true body and a reasonable soul, which did not subsist personally, was assumed into the person of the Word, or the Son, and was so joined to Him that the human nature became “substantial with the Logos.”[4]
Turretin goes on to explain the way this personal union happens. He says that the union of the two natures is by a “personal sustenation,” activity, or operation, of the Son of God within and by the human nature, such that Christ’s human nature really is one of the two natures of the Son of God.[5] Put differently, the action of God the Son within, throughout, and by His rational human nature is nothing other than the very person of God the Son, according to His human nature. Herman Bavinck, quoting Thomas, writes, “The human nature in Christ must be considered as though it were a kind of organ of the divine nature.”[6] The Triune God so acts upon a human nature that the resulting action, or personal operation, within, throughout, and by that nature is that of the Son of God.
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