This voice came not for my sake. Had Christ no need of being strengthened, or did the Father care less for him than for us? But we must attend to this principle. As it was on our account that Christ clothed himself with flesh, so all the blessings which he received from the Father were bestowed on our account. Again, it is also true, that the voice came from heaven for the sake of the people; for he had no need of an outward miracle. Besides, there is here an indirect reproof, that the Jews are deaf like stones to the voice of God; for since God speaks for their sake, there can be no excuse for their ingratitude, when they do not lend their ears.

Came not because of me - Not to strengthen or confirm me; not that I had any doubts about my course, or any apprehension that God would not approve me and glorify his name.
For your sakes - To give you a striking and indubitable proof that I am the Messiah; that you may remember it when I am departed, and be yourselves comforted, supported, and saved.

This voice came not because of me, but for your sakes - Probably meaning those Greeks who had been brought to him by Philip and Andrew. The Jews had frequent opportunities of seeing his miracles, and of being convinced that he was the Messiah; but these Greeks, who were to be a first fruits of the Gentiles, had never any such opportunity. For their sakes, therefore, to confirm them in the faith, this miraculous voice appears to have come from heaven.

(7) Jesus answered and said, This voice came not because of me, but for your sakes.
(7) Christ foretells to the deaf the manner of his death, the overcoming of the devil and the world, and in conclusion his triumph.

Jesus answered and said,.... To the people that stood by, and were disputing among themselves about what they heard, whether it was thunder, or the voice of an angel:
this voice came not because of me; at least not only and chiefly; it was not so much in answer to his prayer, or in order to comfort him under the apprehensions he had of his sufferings and death, or to assure him of his future glorification, though all this was true:
but for your sakes; to convince them that he was the Messiah, and engage them to believe in him, or to leave them without excuse; since not only miracles were wrought before their eyes, but with their ears they heard God speaking to him, and which is the rule that they themselves prescribe; for according to them, no man is to be hearkened to, though he should do as many signs and wonders as Moses, the son of Amram, unless they hear with their ears, that the Lord speaks to him as he did to Moses (c).
(c) R. Mosis Kotsensis praefat. ad Mitzvot Tora, pr. Affirm.

Jesus . . . said, This voice came not because of me, but for your sakes--that is, probably, to correct the unfavorable impressions which His momentary agitation and mysterious prayer for deliverance may have produced on the by-standers.

This voice came not because of me. He had already won the victory before the voice came. It was rather to confirm the faith of his disciples, who still stumbled over the prospect of his death.