As John was completing his work, he said: 'Who do you think I am? I am not that one. No, but he is coming after me, whose sandals I am not worthy to untie.' Acts 13:25
Some people thought John the Baptist was the Messiah. John clearly rejected that idea, not wanting to receive any glory that belonged to the true Messiah, Jesus Christ. John made it clear that though he was used mightily by God, he was not worthy to untie the real Messiah’s sandal straps!
Of course we know that the real Messiah of whom John spoke is Jesus.
Jesus said John was the greatest of the prophets (Luke 7:28). What made him the greatest prophet? (1) John not only prophesied about the Messiah, but was himself also prophesied about (in Malachi and Isaiah). (2) The other Old Testament prophets spoke of the Messiah, but did not know who He was. John not only spoke about Jesus, but knew and introduced Him!
Though Jesus spoke so highly of John, John rightly subjugated himself to Jesus. No matter how the Lord may use us for His glory, no matter how people may profusely thank God for us, let us be sure to give all glory to Him, claiming none for ourselves.