It may also be replied that, as Ambrose observes in his commentary on Luke 7:19, he made this inquiry, not from doubt or ignorance but from devotion: or again, with Chrysostom (Hom. xxxvi in Matth.), that he inquired, not as though ignorant himself, but because he wished his disciples to be satisfied on that point, through Christ: hence the latter framed His answer so as to instruct the disciples, by pointing to the signs of His works.
Reply Obj. 3: Many of the gentiles received revelations of Christ, as is clear from their predictions. Thus we read (Job 19:25): "I know that my Redeemer liveth." The Sibyl too foretold certain things about Christ, as Augustine states (Contra Faust. xiii, 15). Moreover, we read in the history of the Romans, that at the time of Constantine Augustus and his mother Irene a tomb was discovered, wherein lay a man on whose breast was a golden plate with the inscription: "Christ shall be born of a virgin, and in Him, I believe. O sun, during the lifetime of Irene and Constantine, thou shalt see me again" [*Cf. Baron, Annal., A.D. 780]. If, however, some were saved without receiving any revelation, they were not saved without faith in a Mediator, for, though they did not believe in Him explicitly, they did, nevertheless, have implicit faith through believing in Divine providence, since they believed that God would deliver mankind in whatever way was pleasing to Him, and according to the revelation of the Spirit to those who knew the truth, as stated in Job 35:11: "Who teacheth us more than the beasts of the earth." _______________________
EIGHTH ARTICLE [II-II, Q. 2, Art. 8]
Whether It Is Necessary for Salvation to Believe Explicitly in the
Trinity?
Objection 1: It would seem that it was not necessary for salvation to believe explicitly in the Trinity. For the Apostle says (Heb. 11:6): "He that cometh to God must believe that He is, and is a rewarder to them that seek Him." Now one can believe this without believing in the Trinity. Therefore it was not necessary to believe explicitly in the Trinity.
Obj. 2: Further our Lord said (John 17:5, 6): "Father, I have manifested Thy name to men," which words Augustine expounds (Tract. cvi) as follows: "Not the name by which Thou art called God, but the name whereby Thou art called My Father," and further on he adds: "In that He made this world, God is known to all nations; in that He is not to be worshipped together with false gods, 'God is known in Judea'; but, in that He is the Father of this Christ, through Whom He takes away the sin of the world, He now makes known to men this name of His, which hitherto they knew not." Therefore before the coming of Christ it was not known that Paternity and Filiation were in the Godhead: and so the Trinity was not believed explicitly.
Obj. 3: Further, that which we are bound to believe explicitly of God is the object of heavenly happiness. Now the object of heavenly happiness is the sovereign good, which can be understood to be in God, without any distinction of Persons. Therefore it was not necessary to believe explicitly in the Trinity.
On the contrary, In the Old Testament the Trinity of Persons is expressed in many ways; thus at the very outset of Genesis it is written in manifestation of the Trinity: "Let us make man to Our image and likeness" (Gen. 1:26). Therefore from the very beginning it was necessary for salvation to believe in the Trinity.
I answer that, It is impossible to believe explicitly in the mystery of Christ, without faith in the Trinity, since the mystery of Christ includes that the Son of God took flesh; that He renewed the world through the grace of the Holy Ghost; and again, that He was conceived by the Holy Ghost. Wherefore just as, before Christ, the mystery of Christ was believed explicitly by the learned, but implicitly and under a veil, so to speak, by the simple, so too was it with the mystery of the Trinity. And consequently, when once grace had been revealed, all were bound to explicit faith in the mystery of the Trinity: and all who are born again in Christ, have this bestowed on them by the invocation of the Trinity, according to Matt. 28:19: "Going therefore teach ye all nations, baptizing them in the name of the Father, and of the Son and of the Holy Ghost."
Reply Obj. 1: Explicit faith in those two things was necessary at all times and for all people: but it was not sufficient at all times and for all people.