The same came to him by night, and said to him, "Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do, unless God is with 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. 