John 1:7

(t. ii. c. 28) Some try to undo the testimonies of the Prophets to Christ, by saying that the Son of God had no need of such witnesses; the wholesome words which He uttered and His miraculous acts being sufficient to produce belief; just as Moses deserved belief for his speech and goodness, and wanted no previous witnesses. To this we may reply, that, where there are a number of reasons to make people believe, persons are often impressed by one kind of proof, and not by another, and God, Who for the sake of all men became man, can give them many reasons for belief in Him. And with respect to the doctrine of the Incarnation, certain it is that some have been forced by the Prophetical writings into an admiration of Christ by the fact of so many prophets having, before His advent, fixed the place of His nativity; and by other proofs of the same kind. It is to be remembered too, that, though the display of miraculous powers might stimulate the faith of those who lived in the same age with Christ, they might, in the lapse of time, fail to do so; as some of them might even get to be regarded as fabulous. Prophecy and miracles together are more convincing than simply past miracles by themselves. We must recollect too that men receive honour themselves from the witness which they bear to God. He deprives the Prophetical choir of immeasurable honour, whoever denies that it was their office to bear witness to Christ. John when he comes to bear witness to the light, follows in the train of those who went before him.

"The same came for a witness, to bear witness of that Light." What is this, perhaps one may say, the servant bear witness to his Master? When then you see Him not only witnessed to by His servant, but even coming to him, and with Jews baptized by him, will you not be still more astonished and perplexed? Yet you ought not to be troubled nor confused, but amazed at such unspeakable goodness... And the Evangelist using the same language as his Master, after saying, "to bear witness of that Light," adds, "That all men through Him might believe." All but saying, Think not that the reason why John the Baptist came to bear witness, was that he might add aught to the trustworthiness of his Master. No; (He came,) that by his means beings of his own class might believe.

Therefore, because He was so man, that the God lay hid in Him, there was sent before Him a great man, by whose testimony He might be found to be more than man. And who is this? "He was a man." And how could that man speak the truth concerning God? "He was sent by God." What was he called? "Whose name was John." Wherefore did he come? "He came for a witness, that he might bear witness concerning the light, that all might believe through him." What sort of man was he who was to bear witness concerning the light? Something great was that John, vast merit, great grace, great loftiness! Admire, by all means, admire; but as it were a mountain. But a mountain is in darkness unless it be clothed with light. Therefore only admire John that you may hear what follows, "He was not that light;" lest if, when thou thinkest the mountain to be the light, thou make shipwreck on the mountain, and find not consolation. But what oughtest thou to admire? The mountain as a mountain. But lift thyself up to Him who illuminates the mountain, which for this end was elevated that it might be the first to receive the rays, and make them known to your eyes. Therefore, "he was not that light."

(Tr. ii. c. 6) Wherefore came he? The same came for a witness, to bear witness of the Light.

(Bed. in loc.) He saith not, that all men should believe in him; for, cursed be the man that trusteth in man; (Jer. 17:5) but, that all men through him might believe; i. e. by his testimony believe in the Light.