Why the Son Incarnated Rather Than Father or Spirit

The question of why the Son incarnated rather than the Father or Spirit is rooted in the biblical account of the incarnation and the theological understanding of the Trinity. The doctrine of the incarnation is primarily associated with the Son, Jesus Christ, who is described as taking on human flesh ^[2].

Biblical Foundations

The biblical foundation for the incarnation of the Son is found in passages such as Romans 8:3, where it is written that "God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh" ^[2]. This verse highlights the unique role of the Son in the incarnation. The distinction between the persons of the Trinity is also evident in other biblical passages, such as Galatians 4:29, which contrasts the son born by the flesh with the son born by the Spirit ^[1].

Patristic and Theological Explanations

Early Christian theologians grappled with the question of why the Son, rather than the Father or Spirit, became incarnate. Augustine of Hippo addressed this issue, noting that the union of persons in the Trinity is a complex matter that is understood and believed in the Catholic faith ^[3]. He questioned why the perplexity about the Son's incarnation did not extend to the Holy Spirit as well.

Augustine further explored the distinctions within the Trinity, particularly the relationships between the Father, Son, and Holy Spirit. He discussed how the Son is begotten by the Father, and the Holy Spirit proceeds from both the Father and the Son, highlighting the unique characteristics of each person ^{[5, 6]}. The procession of the Holy Spirit from both the Father and the Son is a key aspect of Trinitarian theology, underscoring the distinct roles within the Godhead.

Theological Rationale for the Son's Incarnation

Thomas Aquinas provided a theological rationale for why it was fitting for the Son to become incarnate. He argued that the Person of the Son, as the Word of God, has a certain common agreement with all creatures, being the exemplar likeness of whatever is made by God. This similarity makes the Son's assumption of human nature particularly fitting ^[8].

John Calvin also contributed to the understanding of the Trinity and the incarnation. He emphasized the distinction of order within the Trinity, where the Father is considered first, followed by the Son from the Father, and then the Spirit from both. This order is not merely sequential but reflects the natural inclination of the human mind to consider God, then His wisdom (the Son), and finally His energy (the Spirit) ^[7].

Tradition and Interpretation

The Reformed tradition, as represented by Charles Hodge, underscores the significance of the Son's incarnation for understanding His true humanity and divinity. Hodge notes that the incarnation involved the Son taking into personal and perpetual union with Himself a nature infinitely lower than His own, an act of unspeakable condescension and love ^[4].

The various traditions within Christianity, including Catholic, Eastern Orthodox, and Reformed, have grappled with the mystery of the incarnation and the specific role of the Son. While there are nuances in how different traditions articulate the doctrine, the core affirmation that the Son became incarnate remains a central tenet of Christian theology.

The incarnation of the Son rather than the Father or Spirit is deeply rooted in the biblical narrative and the theological understanding of the Trinity. The distinct roles and relationships within the Godhead, as understood through the lens of Scripture and theological reflection, provide the framework for understanding this doctrine. The Son's incarnation is seen as a manifestation of God's love and redemption, with the specific role of the Son being integral to the plan of salvation.

Sources

Galatians “Galatians 4:29 (BSB) — At that time, however, the son born by the flesh persecuted the son born by the Spirit. It is the same now.”
Romans “Romans 8:3 (KJV) — For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:”
Schaff ANF/NPNF (Patristic) “NPNF1 Vol 1: Augustine — Confessions, Letters — TO NEBRIDIUS AUGUSTIN SENDS GREETING. (part 2): lest they take up time which ought to be devoted to better things. With regard, then, to the subject which I have at this time undertaken, first of all I am surprised that you were perplexed by the question why not the! Father, but the Son, is said to have become incarnate, and yet were not also perplexed by the same question in regard to the Holy Spirit. For the union of Persons in the Trinity is in the Catholic faith set forth and believed, and by a few holy and blessed ones understood, to be so i”
CCEL (Reformed (Old Princeton)) “Charles Hodge, Systematic Theology, Vol. 2, section 126: substance of the Virgin Mary.” This is involved in the Scriptural statement that He was born of a woman, which can only mean that He was born in the sense in which other children of men are born of women. This is essential to his true humanity, and to that likeness to men which makes them his brethren, and which was se cured by his taking part in flesh and blood. ( Heb. ii. 14 .) The incarnation of the Son of God, his stooping to take into personal and perpetual union with Himself a nature infinitely lower than his own, was an act of uns”
Schaff ANF/NPNF (Patristic) “NPNF1 Vol 3: Augustine — On the Holy Trinity — CHAP. 14.--THE FATHER AND THE SON THE ONLY BEGINNING (PRINCIPIUM) OF THE HOLY SPIRIT. (part 1): 15. But in their mutual relation to one another in the Trinity itself, if the begetter is a beginning in relation to that which he begets, the Father is a beginning in relation to the Son, because the begets Him; but whether the Father is also a beginning in relation to the Holy Spirit, since it is said, "He proceeds from the Father," is no small question. Because, if it is so, He will not only be a beginning to that thing which He begets or makes, but ”
Schaff ANF/NPNF (Patristic) “NPNF1 Vol 3: Augustine — On the Holy Trinity — CHAP. 3.--SOME THINGS CONCERNING THE HOLY SPIRIT ARE TO BE UNDERSTOOD ACCORDING TO THE ONE RULE ONLY. (part 2): speak of Himself, but whatsoever He shall hear, that shall He speak;" for the words belong to Him as proceeding from the Father. But whereas both the Son is of the Father, and the Holy Spirit proceeds from the Father, why both are not called sons, and both not said to be begotten, but the former is called the one only-begotten Son, and the latter, viz. the Holy Spirit, neither son nor begotten, because if begotten, then certainly a son, ”
CCEL (Reformed) “John Calvin, Institutes of the Christian Religion, section 29: there can be no room for first or last, still the distinction of order is not unmeaning or superfluous, the Father being considered first, next the Son from him, and then the Spirit from both. For the mind of every man naturally inclines to consider, first, God, secondly, the wisdom emerging from him, and, lastly, the energy by which he executes the purposes of his counsel. For this reason, the Son is said to be of the Father only; the Spirit of both the Father and the Son. This is done in many passages, but in none more clearly th”
theology (Catholic (Scholastic)) “Aquinas, Summa Theologica, Third Part (Tertia Pars), Of the Mode of Union on the Part of the Person Assuming, Art. 8: Article: Whether it was more fitting that the Person of the Son rather than any other Divine Person should assume human nature? I answer that, It was most fitting that the Person of the Son should become incarnate. First, on the part of the union; for such as are similar are fittingly united. Now the Person of the Son, Who is the Word of God, has a certain common agreement with all creatures, because the word of the craftsman, i.e. his concept, is an exemplar likeness of whatev”

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