Whether it was more fitting that the Person of the Son rather than any other Divine Person should assume human nature?

❌ Objection 1 : It would seem that it was not more fitting that the Son of God should become incarnate than the Father or the Holy Ghost. For by the mystery of the Incarnation men are led to the true knowledge of God, according to Jn. 18:37: "For this was I born, and for this came I into the world, to give testimony to the truth." But by the Person of the Son of God becoming incarnate many have been kept back from the true knowledge of God, since they referred to the very Person of the Son what was said of the Son in His human nature, as Arius, who held an inequality of Persons, according to what is said (Jn. 14:28): "The Father is greater than I." Now this error would not have arisen if the Person of the Father had become incarnate, for no one would have taken the Father to be less than the Son. Hence it seems fitting that the Person of the Father, rather than the Person of the Son, should have become incarnate.

❌ Objection 2 : Further, the effect of the Incarnation would seem to be, as it were, a second creation of human nature, according to Gal. 6:15: "For in Christ Jesus neither circumcision availeth anything, nor uncircumcision, but a new creature." But the power of creation is appropriated to the Father. Therefore it would have been more becoming to the Father than to the Son to become incarnate.

❌ Objection 3 : Further, the Incarnation is ordained to the remission of sins, according to Mt. 1:21: "Thou shalt call His name Jesus. For He shall save His people from their sins." Now the remission of sins is attributed to the Holy Ghost according to Jn. 20:22,23: "Receive ye the Holy Ghost. Whose sins you shall forgive, they are forgiven them." Therefore it became the Person of the Holy Ghost rather than the Person of the Son to become incarnate.