John 1:20

Verse 20. I am not the Christ. This confession proves that John was not an impostor. He had a wide reputation. The nation was expecting that the Messiah was about to come, and multitudes were ready to believe that John was he, Lk 3:15. If John had been an impostor he would have taken advantage of this excited state of public feeling, proclaimed himself to be the Messiah, and formed a large party in his favour. The fact that he did not do it is full proof that he did not intend to impose on men, but came only as the forerunner of Christ; and his example shows that all Christians, and especially all Christian ministers, however much they may be honoured and blessed, should be willing to lay all their honours at the feet of Jesus; to keep themselves back and to hold up before the world only the Son of God. To do this is one eminent mark of the true spirit of a minister of the gospel.

John 1:27

Verse 27. Whose shoe's latchet. Mt 3:11. The latchet of sandals was the string or thong by which they were fastened to the feet. To unloose them was the office of a servant, and John means, therefore, that he was unworthy to perform the lowest office for the Messiah. This was remarkable humility. John was well known; he was highly honoured; thousands came to hear him. Jesus was at that time unknown; but John says that he was unworthy to perform the humblest office for Jesus. So we all should be willing to lay all that we have at the feet of Christ, and feel that we are unworthy to be his lowest servants.
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