No man hath seen God at any time. If understood of the vision of comprehension this is universally true of every creature, man or angel; if of seeing God in His essence without comprehending Him, it is true of all while they are here below. The latter is the sense here, for the Evangelist wishes to signify that he could not have learned from any mere mortal the foregoing doctrine. The saints in heaven see God in His essence, for as our Evangelist tells us in his First Epistle: “We shall see Him as He is” (1 John iii. 2. See also [John xvii. 3]).

The only-begotten Son. Instead of: “The only-begotten Son,” the reading: “God only-begotten” is found in very many ancient authorities, and is almost equally probable. Were it certain, it would be an additional proof of Christ's Divinity. Christ is the only-begotten Son of God, because while He is the natural Son of God, all others are but adopted sons.

Who is in the bosom of the Father (εἰς τὸν κόλπον τοῦ πατρός). This means that the Son is consubstantial with the Father: “In illo ergo sinu, id est in occultissimo paternae naturae et essentiae, quae excedit omnem virtutem creaturae, est unigenitus Filius, et ideo consubstantialis est Patri.” St. Thomas on this verse.

He hath declared him. “Him” is not represented in the original; and if our view of the verse is the correct one, the object of the verb “hath [pg 034] declared” is not so much the Word, as the doctrine contained in this prologue concerning Him.[30]

19. Et hoc est testimonium Ioannis, quando miserunt Iudaei ab Ierosolymis sacerdotes et Levitas ad eum, ut interrogarent eum: Tu quis es?19. And this is the testimony of John, when the Jews sent from Jerusalem priests and Levites to him, to ask him: Who art thou?

19. The Evangelist now records, with its various circumstances, one of the most solemn testimonies borne by the Baptist to Christ. The “Jews” are probably the Sanhedrim, whose duty it was to inquire into the credentials of preachers. The deputation was, therefore, a most solemn one, sent by the Sanhedrim, from the Jewish capital, composed of Priests and Levites, to make inquiries regarding a momentous question.

20. Et confessus est, et non negavit: et confessus est: Quia non sum ego Christus.20. And he confessed, and did not deny: and he confessed: I am not the Christ.

20. The Baptist first confesses what he is not, and what many at the time believed him to be, namely, the Christ (Luke iii. 15).

21. Et interrogaverunt eum: Quid ergo? Elias es tu? Et dixit: Non sum. Propheta es tu? Et respondit: Non.21. And they asked him: What then? Art thou Elias? And he said: I am not. Art thou the prophet? And he answered: No.
22. Dixerunt ergo ei: Quis es, ut responsum demus his qui miserunt nos? quid dicis de teipso?22. They said therefore unto him: Who art thou, that we may give an answer to them that sent us? What sayest thou of thyself?

21. Art thou Elias? This question arose from a misunderstanding of Mal. iv. 5. Art thou the prophet? (ὁ προφήτης), as foretold by Moses (Deut. xviii. 15). These interrogators evidently regarded “the prophet” as different from the Messias, though in reality they were the same. See Acts iii. 22-24.