The Holy Spirits distinctive role is to fulfill what we may call a floodlight ministry in relation to the Lord Jesus Christ. So far as this role was concerned, the Spirit “was not yet” (John 7:29, literal Greek) while Jesus was on earth; only when the Father had glorified him (John 17:1, 5) could the Spirits work of making men aware of Jesus glory begin.
I remember walking to church one winter evening to preach on the words, “He will glorify me” (John 16:14), seeing the building floodlit as I turned a corner, and realizing that this was exactly the illustration my message needed. When floodlighting is well done, the floodlights are placed so that you do not see them; in fact, you are not supposed to see where the light is coming from; what you are meant to see is just the building on which the floodlights are trained. The intended effect is to make it visible when otherwise it would not be seen for the darkness, and to maximize its dignity by throwing all its details into relief so that you can see it properly. This perfectly illustrated the Spirits new covenant role. He is, so to speak, the hidden floodlight shining on the Savior.
Or think of it this way. It is as if the Spirit stands behind us, throwing light over our shoulder on to Jesus who stands facing us. The Spirits message to us is never, “Look at me; listen to me; come to me; get to know me”, but always, “Look at him, and see his glory; listen to him and hear his word; go to him and have life; get to know him and taste his gift of joy and peace.” The Spirit, we might say, is the matchmaker, the celestial marriage broker, whose role it is to bring us and Christ together and ensure that we stay together.