But according to those who suppose two persons or two hypostases or two supposita in Christ, no reason prevents Christ being called the adopted Son of God.
Reply Obj. 1: As sonship does not properly belong to the nature, so neither does adoption. Consequently, when it is said that "carnal humanity is adopted," the expression is metaphorical: and adoption is used to signify the union of human nature to the Person of the Son.
Reply Obj. 2: This comparison of Augustine is to be referred to the principle because, to wit, just as it is granted to any man without meriting it to be a Christian, so did it happen that this man without meriting it was Christ. But there is a difference on the part of the term: because by the grace of union Christ is the natural Son; whereas another man by habitual grace is an adopted son. Yet habitual grace in Christ does not make one who was not a son to be an adopted son, but is a certain effect of Filiation in the soul of Christ, according to John 1:14: "We saw His glory . . . as it were of the Only-begotten of the Father; full of grace and truth."
Reply Obj. 3: To be a creature, as also to be subservient or subject to God, regards not only the person, but also the nature: but this cannot be said of sonship. Wherefore the comparison does not hold. _______________________
QUESTION 24
OF THE PREDESTINATION OF CHRIST
(In Four Articles)
We shall now consider the predestination of Christ. Under this head there are four points of inquiry:
(1) Whether Christ was predestinated?
(2) Whether He was predestinated as man?
(3) Whether His predestination is the exemplar of ours?