"There was a man sent from God whose name was John. He came as a witness to testify concerning that light, so that through him all might believe. He himself was not the light; he came only as a witness to the light." John 1:6-8
We all know its talking about John but at that same time isn't it talking about us? The very second we give our lives to Christ we become children of God. Thereby we become witnesses for Christ. Not many people know that but it's true. Since we have the Light in us we become witnesses of that same Light.