The Preparation for the Final Manifestation. The way was prepared for the final revelation by the work of John. The author takes the opportunity of asserting John's true position as against the extravagant claims apparently made for him, either by his own followers, or the Jews in general. His duty was that of the forerunner to herald the approach of the light.
Related Commentaries of John 1:6
John 1:6-8
6 There was a man sent from God, whose name was John.
7 The same came for a witness, to bear witness of the Light, that all men through him might believe.
8 He was not that Light, but was sent to bear witness of that Light.