He was not that Light, but was sent to bear witness of that Light.
He is content to claim for his master as for himself the noblest human work, "to bear witness of that Light." No one may add to it; all may, in word and life, bear witness to it. Every discovery in science and advance in truth is a removal of some cloud which hides it from men; every noble character is bearing it about; every conquest of sin is extending it. It has been stored in mines of deepest thought in all ages. The heedless puss over the surface unconscious of it. The world's benefactors are they who bring it forth to men as the light and warmth of the rays of the Sun of Righteousness.
(H. W. Watkins, D. D.)
Parallel VersesKJV: He was not that Light, but was sent to bear witness of that Light.