John 8:13

II. The objection which the Pharisees made against this doctrine, and it was very trifling and frivolous: Thou bearest record of thyself; thy record is not true, v. 13. In this objection they went upon the suspicion which we commonly have of men's self-condemnation, which is concluded to be the native language of self-love, such as we are all ready to condemn in others, but few are willing to own in themselves. But in this case the objection was very unjust, for, 1. They made that his crime, and a diminution to the credibility of his doctrine, which in the case of one who introduced a divine revelation was necessary and unavoidable. Did not Moses and all the prophets bear witness of themselves when they avouched themselves to be God's messengers? Did not the Pharisees ask John Baptist, What sayest thou of thyself? 2. They overlooked the testimony of all the other witnesses, which corroborated the testimony he bore of himself. Had he only borne record of himself, his testimony had indeed been suspicious, and the belief of it might have been suspended; but his doctrine was attested by more than two or three credible witnesses, enough to establish every word of it.

Verses 12-16 Christ is the Light of the world. God is light, and Christ is the image of the invisible God. One sun enlightens the whole world; so does one Christ, and there needs no more. What a dark dungeon would the world be without the sun! So would it be without Jesus, by whom light came into the world. Those who follow Christ shall not walk in darkness. They shall not be left without the truths which are necessary to keep them from destroying error, and the directions in the way of duty, necessary to keep them from condemning sin.