They came to John, and said to him, "Rabbi, he who was with you beyond the Jordan, to whom you have testified, behold, the same baptizes, and everyone is coming to him."

 It is John's grief that so few accept the message that Jesus brought; but when a man does accept it, he attests the fact that in his belief the word of God is true. In the ancient world, if a man wished to give his full approval to a document, such as a will or an agreement or a constitution, he affixed his seal to the foot of it. The seal was the sign that he agreed with this and regarded it as binding and true. So when a man accepts the message of Jesus, he affirms and attests that he believes what God says is true. 