Reply Obj. 3: For judgment to be passed, the authority of the judge needs to be known: and for this reason it behooves that the coming of Christ unto judgment should be manifest. But His first coming was unto the salvation of all, which is by faith that is of things not seen. And therefore it was fitting that His first coming should be hidden. _______________________
SECOND ARTICLE [III, Q. 36, Art. 2]
Whether Christ's Birth Should Have Been Made Known to Some?
Objection 1: It would seem that Christ's birth should not have been made known to anyone. For, as stated above (A. 1, ad 3), it befitted the salvation of mankind that Christ's first coming should be hidden. But Christ came to save all; according to 1 Tim. 4:10: "Who is the Saviour of all men, especially of the faithful." Therefore Christ's birth should not have been made known to anyone.
Obj. 2: Further, before Christ was born, His future birth was made known to the Blessed Virgin and Joseph. Therefore it was not necessary that it should be made known to others after His birth.
Obj. 3: Further, no wise man makes known that from which arise disturbance and harm to others. But, when Christ's birth was made known, disturbance arose: for it is written (Matt. 2:3) that "King Herod, hearing" of Christ's birth, "was troubled, and all Jerusalem with him." Moreover, this brought harm to others; because it was the occasion of Herod's killing "all the male children that were in Bethlehem . . . from two years old and under." Therefore it seems unfitting for Christ's birth to have been made known to anyone.
On the contrary, Christ's birth would have been profitable to none if it had been hidden from all. But it behooved Christ's birth to be profitable: else He were born in vain. Therefore it seems that Christ's birth should have been made known to some.
I answer that, As the Apostle says (Rom. 13:1) "what is of God is well ordered." Now it belongs to the order of Divine wisdom that God's gifts and the secrets of His wisdom are not bestowed on all equally, but to some immediately, through whom they are made known to others. Wherefore, with regard to the mystery of the Resurrection it is written (Acts 10:40, 41): "God . . . gave" Christ rising again "to be made manifest, not to all the people, but to witnesses pre-ordained by God." Consequently, that His birth might be consistent with this, it should have been made known, not to all, but to some, through whom it could be made known to others.
Reply Obj. 1: As it would have been prejudicial to the salvation of mankind if God's birth had been made known to all men, so also would it have been if none had been informed of it. Because in either case faith is destroyed, whether a thing be perfectly manifest, or whether it be entirely unknown, so that no one can hear it from another; for "faith cometh by hearing" (Rom. 10:17).
Reply Obj. 2: Mary and Joseph needed to be instructed concerning Christ's birth before He was born, because it devolved on them to show reverence to the child conceived in the womb, and to serve Him even before He was born. But their testimony, being of a domestic character, would have aroused suspicion in regard to Christ's greatness: and so it behooved it to be made known to others, whose testimony could not be suspect.