The same came for a witness, to bear witness of the Light, that all men through him might believe.
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Cyril of Alexandria
AD 444
The word This is full of declaration of virtue and praise of person. For he that was sent, he says, from God, he that with reason struck with astonishment the whole of Judaea, by the gravity of his life and its marvellous exercise in virtue, he that is fore-announced by the voice of the holy Prophets: called by Isaiah, The voice of him that crieth in the wilderness, and by the blessed David, a lamp fore-ordained for Christ; This man came for a witness to hear witness of the Light. He here calls God the Word Light, and shews that He is One and strictly the very actual Light, with Whom there is by nature nought else that has the property of illumining, and that is not lacking light. Therefore foreign and, so to say, of other nature than the creature is the Word of God, since verily and truly is He strictly Light, the creature participate of light. He then that is unclassed with things made, and conceived of therefore as being of other nature than they, how will He be originate, rather ho...
That all men might believe through him; i.e. by John the Baptist's preaching, who was God's instrument to induce them to believe in Jesus the Christ, or the Messias, their only Redeemer. (Witham)
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. Though if any still continue bewildered and confused, He will say to such an one what He said to John, Suffer it to be so now, for thus it becomes us to fulfill all righteousness Matthew 3:15; and, if any be still further troubled, again He will say to him too what he said to the Jews, But I receive not testimony from man. John 5:34 If now he needs not this witness, why was John sent from God? Not as though He required his testimony— this were extremest blasphemy. Why then? John himself informs us, when he says,
That all men through him might believe.
And Christ also, after having said that I receive not testimony from man John 5:34, in order that He ...
This man was sent by God in order to bear witness of the Light. Lest anyone imagine that the Only-begotten was in need of this witness because He Himself lacked in something, the Evangelist immediately follows his statement, that John came to bear witness to the Son of God, with the reason, namely, that all men through him might believe. Did all men in fact believe through him? No. In what sense, then, did the Evangelist say, that all men ...might believe? As much as it was his part to do, John gave witness in order to draw all men to the Light; if some did not believe, he is not to blame. The sun rises each day for the purpose of giving light to all. If a man shuts himself up in a gloomy dwelling and does not enjoy the sun’s rays, is the sun at fault? So it is here. John was sent so that all might believe. It is not his fault that it turned out otherwise.