Reply Obj. 1: To give grace or the Holy Ghost belongs to Christ as He is God, authoritatively; but instrumentally it belongs also to Him as man, inasmuch as His manhood is the instrument of His Godhead. And hence by the power of the Godhead His actions were beneficial, i.e. by causing grace in us, both meritoriously and efficiently. But Augustine denies that Christ as man gives the Holy Ghost authoritatively. Even other saints are said to give the Holy Ghost instrumentally, or ministerially, according to Gal. 3:5: "He . . . who giveth to you the Spirit."
Reply Obj. 2: In metaphorical speech we must not expect a likeness in all respects; for thus there would be not likeness but identity. Accordingly a natural head has not another head because one human body is not part of another; but a metaphorical body, i.e. an ordered multitude, is part of another multitude as the domestic multitude is part of the civil multitude; and hence the father who is head of the domestic multitude has a head above him, i.e. the civil governor. And hence there is no reason why God should not be the Head of Christ, although Christ Himself is Head of the Church.
Reply Obj. 3: The head has a manifest pre-eminence over the other exterior members; but the heart has a certain hidden influence. And hence the Holy Ghost is likened to the heart, since He invisibly quickens and unifies the Church; but Christ is likened to the Head in His visible nature in which man is set over man. _______________________
SECOND ARTICLE [III, Q. 8, Art. 2]
Whether Christ Is the Head of Men As to Their Bodies or Only As to
Their Souls?
Objection 1: It would seem that Christ is not the Head of men as to their bodies. For Christ is said to be the Head of the Church inasmuch as He bestows spiritual sense and the movement of grace on the Church. But a body is not capable of this spiritual sense and movement. Therefore Christ is not the Head of men as regards their bodies.
Obj. 2: Further, we share bodies with the brutes. If therefore Christ was the Head of men as to their bodies, it would follow that He was the Head of brute animals; and this is not fitting.
Obj. 3: Further, Christ took His body from other men, as is clear from Matt. 1 and Luke 3. But the head is the first of the members, as was said above (A. 1, ad 3). Therefore Christ is not the Head of the Church as regards bodies.
On the contrary, It is written (Phil. 3:21): "Who will reform the body of our lowness, made like to the body of His glory."
I answer that, The human body has a natural relation to the rational soul, which is its proper form and motor. Inasmuch as the soul is its form, it receives from the soul life and the other properties which belong specifically to man; but inasmuch as the soul is its motor, the body serves the soul instrumentally. Therefore we must hold that the manhood of Christ had the power of influence, inasmuch as it is united to the Word of God, to Whom His body is united through the soul, as stated above (Q. 6, A. 1). Hence the whole manhood of Christ, i.e. according to soul and body, influences all, both in soul and body; but principally the soul, and secondarily the body: First, inasmuch as the "members of the body are presented as instruments of justice" in the soul that lives through Christ, as the Apostle says (Rom. 6:13): secondly, inasmuch as the life of glory flows from the soul on to the body, according to Rom. 8:11: "He that raised up Jesus from the dead shall quicken also your mortal bodies, because of His Spirit that dwelleth in you."