John answered them, "I baptize in water, but among you stands one whom you don't know.

 Slowly the Jews and Greeks had thought their way to the conception of the Logos ( G3056) , the Mind of God which made the world and makes sense of it. So John went out to Jews and Greeks to tell them that in Jesus Christ this creating, illuminating, controlling, sustaining mind of God had come to earth. He came to tell them that men need no longer guess and grope; all that they had to do was to look at Jesus and see the Mind of God. 