13. *But when he, the Spirit of truth, is come.* Though you are now unable to bear these truths, you shall be taught them all by the Holy Ghost. The Greek for *will teach* (docebit) is ὀδηγήσει, which means to lead on the way, to conduct; and the sense, therefore, is: He shall _guide_ you into _all the truth_ (which I have still to tell you, but which you are now unable to bear). We are not to suppose that the Apostles were taught all the truth on the day of Pentecost; the revelation was vouchsafed gradually, and at their death the deposit of faith was complete.(101) Since the Apostles’ time, doctrines and dogmas have, indeed, been more fully drawn out and developed, but no new doctrines have been revealed. This follows clearly from the words we are considering; for it was to the Apostles, to those same men who were now unable to bear it, that the Holy Ghost was to teach the _whole_ truth. The promise here made to the Apostles, that they should be taught the whole truth by the Holy Ghost, while it regarded them _directly_, regarded the whole Church indirectly; for it is to them as Apostles, appointed to teach the whole Church, that Christ speaks: “I have chosen you, and have appointed you, that you should go, and should bring forth fruit, and your fruit should remain” (John xv. 16). And in the solemn prayer to the Father, with which this discourse concludes, He prays the Father: “Sanctify them (the Apostles) in (the) truth.... And not for them only do I pray, but for them also who, through their word, shall believe in me.” So that the Apostles first, and through them the Church of Christ, received the whole truth from the Holy Ghost.(102) *For he shall not speak of himself.* These words give a reason why the Holy Ghost shall teach the truth. No other reason than His own Divinity and essential truthfulness was necessary; but, as the Apostles did not yet understand that this new Comforter was Divine, Jesus vouchsafes another reason to convince them of His truthfulness. This other reason is, that the Holy Ghost shall speak to them, not what has been excogitated or invented by Himself, but what he received from the Son of God in His eternal procession. Doubtless the Apostles did not yet know much about the mystery of the Divine procession; still they could gather from these words that the new Comforter was to announce to them the truth, as Christ’s legate, and this was enough.