"Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you." — John 16:7 KJV.
The declaration that it was expedient, or "good," as Luther translates it, for Christ to go away in order that the Comforter might come, proves the fact that the work of the Holy Spirit is so indispensable a complement to His own work that His bodily withdrawal, which is the condition of the Spirit's advent, should awaken great joy in the hearts of His disciples. A few disciples, comparatively, had seen Him in His humiliation, rejected of men; now One was to come who should be a mirror in which all disciples in all lands and in all generations should see Him glorified, and, seeing, "should be transformed into the same image from glory to glory." Without Jesus radiant with divinity, the Comforter would have nothing to reproduce in the heart of the believer. It would be like removing from the photographer's studio the person whose features the sun is about to fix on the plate prepared to receive them.