Albert Barnes Commentary John 1:7-8

"The same came for witness, that he might bear witness of the light, that all might believe through him. He was not the light, but [came] that he might bear witness of the light." — John 1:7-8 (ASV)

For a witness. To give testimony. He came to prepare the minds of the people to receive him (Matthew 3; Luke 3); to lead them by repentance to God; and to point out the Messiah to Israel when he came (John 1:31).

Of the Light. That is, of the Messiah. .

That all men... It was the object of John's testimony that all men might believe. He designed to prepare them for it; to announce that the Messiah was about to come, to direct people's minds to him, and thus to fit them to believe in him when he came. Thus he baptized them, saying, "That they should believe on him who should come after him" (Acts 19:4), and thus he produced a very general expectation that the Messiah was about to come. The testimony of John was peculiarly valuable for the following reasons:

1. It was made when he had no personal acquaintance with Jesus of Nazareth, and of course there could have been no collusion or agreement to deceive them (John 1:31).
2. It was sufficiently long before he came to excite general attention and to focus attention on it.
3. It was that of a man acknowledged by all to be a prophet of God—"for all men held John to be a prophet" (Matthew 21:26).
4. It was for the express purpose of declaring beforehand that he was about to appear.
5. It was disinterested. He was himself extremely popular. Many were disposed to receive him as the Messiah. It was evidently in his power to form a large party and to be regarded extensively as the Christ. This was the highest honour to which a Jew could aspire; and it shows the value of John's testimony, that he was willing to lay all his honours at the feet of Jesus, and to acknowledge that he was unworthy to perform for him the office of the humblest servant (Matthew 3:11).

Through him. Through John, or by means of his testimony.

Was not that Light. Was not the Messiah. This is an explicit declaration designed to satisfy the disciples of John. The evidence that he was not the Messiah he states in the following verses.

From the conduct of John here we can learn:

1. The duty of laying all our honours at the feet of Jesus.
2. As John came that all might believe, so it is no less true of the ministry of Jesus himself. He came for a similar purpose, and we ALL, therefore, may trust in him for salvation.
3. We should not rely too much on ministers of the gospel. They cannot save us any more than John could; and their office, as his was, is simply to direct people to the Lamb of God that taketh away the sin of the world.