I receive not testimony from men. Yet it was not in vain that God chose Christ to be a witness to him, and Christ himself declares, on another occasion, that the disciples will be his witnesses. You shall be witnesses to me, both in Jerusalem, and in all Judea, and in Samaria, and unto the uttermost part of the earth, (Acts 1:8.) I reply, Christ avails himself of the testimony of John, not because he needs it, but so far as it is advantageous to us to receive from it some confirmation. Men borrow testimony from one another, because they cannot dispense with that assistance. The case is different with God and Christ. For if philosophers assert that virtue has no need of foreign aid, what has man in himself to lend support to the truth of God? And Christ immediately adds, that he produces the testimony of John on their account: these things I say that you may be saved. By this statement he means that it is not so much from a regard to himself as from a desire to promote the advantage of men, that he raises up the heralds of his Gospel by whom he testifies to us concerning his will. In this we see also a striking proof of his wonderful goodness, by which he regulates all things for our salvation. It is therefore our duty, on the other hand, to strive that the great care which he bestows in saving us may not be fruitless.

I receive not testimony from men - I do not depend for proof of my Messiahship on the testimony of men, nor do I pride myself on the commendations or flattery of men.
But these things - "This testimony of John I adduce that you might be convinced. It was evidence of your own seeking. It was clear, full, explicited You 'sent' to make inquiry, and he gave you a candid and satisfactory answer. Had you believed that, you would have believed in the Messiah and been saved." Men are often dissatisfied with the very evidence of the truth of religion which they sought, and on which they professed themselves willing to rely.

But I receive not testimony from man [only] - I have no need of John's testimony: the works that I do bear sufficient testimony to me, John 5:36.
But these things I say, etc. - You believed John to be a prophet - a prophet cannot lie: he bore testimony that I am the Lamb of God, that beareth away the sin of the world, John 1:29; therefore, that ye may be saved by believing in me as such, I have appealed to John's testimony.

But I receive not testimony from man,.... He stood in no need of an human testimony, nor did he rest the truth of his deity and divine sonship thereon: he had other and greater testimonies to produce; as he needed not that any man should testify of man to him, he had no need that any man should testify of him; and if the testimony of men was received, as this of John could not well be objected to, the testimony of God is greater, and which he had; and therefore should not have mentioned John's for his own sake:
but these things I say, that ye might be saved; that is, he produced this testimony of John, who was a person of so great a character among them, that they might be induced by it to believe in him as the Messiah; and so be saved from that ruin and destruction, that would come upon their nation, city, and temple, for their rejection and disbelief of him.

But I have no need to receive, &c. But these things - Concerning John, whom ye yourselves reverence, I say, that ye may be saved - So really and seriously did he will their salvation. Yet they were not saved. Most, if not all of them, died in their sins.