I have still many things to say to you. Christ's discourse could not have so much influence over his disciples, as to prevent their ignorance from still keeping them in perplexity about many things; and not only so, but they scarcely obtained a slight taste of those things which ought to have imparted to them full satisfaction, had it not been for the obstruction arising from the weakness of the flesh. It was, therefore, impossible but that the consciousness of their poverty should oppress them with fear and anxiety. But Christ meets it by this consolation, that, when they have received the Spirit, they will be new men, and altogether different from what they were before. But you are not able to bear them now. When he says that, were he to tell them anything more, or what was loftier, they would not be able to bear it, his object is to encourage them by the hope of better progress, that they may not lose courage; for the grace which he was to bestow on them ought not to be estimated by their present feelings, since they were at so great a distance from heaven. In short, he bids them be cheerful and courageous, whatever may be their present weakness. But as there was nothing else than doctrine on which they could rely, Christ reminds them that he had accommodated it to their capacity, yet so as to lead them to expect that they would soon afterwards obtain loftier and more abundant instruction; as if he had said, "If what you have heard from me is not yet sufficient to confirm you, have patience for a little; for ere long, having enjoyed the teaching of the Spirit, you will need nothing more; he will remove all the ignorance that now remains in you." Now arises a question, what were those things which the apostles were not yet able to learn? The Papists, for the purpose of putting forward their inventions as the oracles of God, wickedly abuse this passage. "Christ," they tell us, "promised to the apostles new revelations; and, therefore, we must not abide solely by Scripture, for something beyond Scripture is here promised by him to his followers." In the first place, if they choose to talk with Augustine, the solution will be easily obtained. His words are, "Since Christ is silent, which of us shall say that it was this or that? Or, if he shall venture to say so, how shall he prove it? Who is so rash and insolent, even though he say what is true, as to affirm, without any Divine testimony, that those are the things which the Lord at that time did not choose to say?" But we have a surer way of refuting them, taken from Christ's own words, which follow.

I have yet many things to say - There were many things pertaining to the work of the Spirit and the establishment of religion which might be said. Jesus had given them the outline; he had presented to them the great doctrines of the system, but he had not gone into details. These were things which they could not then bear. They were still full of Jewish prejudices, and were not prepared for a full development of his plans. He probably refers here to the great change which were to take place in the Jewish system - the abolition of sacrifices and the priesthood, the change of the Sabbath, the rejection of the Jewish nation, etc. For these doctrines they were not prepared, but they would in due time be taught them by the Holy Spirit.

Ye cannot bear them now - In illustration of these three points, Christ had many things to say; but he found that his disciples could only bear general truths; yet, in saying what he did, he sowed the seeds of the whole system of theological knowledge, and heavenly wisdom, which the Holy Spirit of this truth afterwards watered and ripened into a glorious harvest of light and salvation, by the ministry of the apostles. Dr. Lightfoot supposes that the things which the apostles could not bear now were such as these:
1. The institution of the Christian Sabbath, and the abolition of the Jewish.
2. The rejection of the whole Jewish nation, at the very time in which they expected to be set up and established for ever.
3. The entire change of the whole Mosaic dispensation, and the bringing the Gentiles into the Church of God.

(4) I have yet many things to say unto you, but ye cannot bear them now.
(4) The doctrine of the apostles proceeded from the Holy Spirit, and is most perfect.

I have yet many things to say unto you,.... Not with respect to the main doctrines of the Gospel, for everything of this kind he had made known unto them, John 15:15; but what regarded the rejection of the Jews, and the calling of the Gentiles, the abrogation of the Mosaic economy, and settling the Gospel church state, which were to come to pass after the death and resurrection of Christ, and the sending of the Spirit:
but ye cannot bear them now; because of their prejudices in favour of their own nation, the law of Moses, and the ceremonies of it, and the setting up of a temporal kingdom.

when he, the Spirit of truth, is come . . . he shall not speak of himself--that is, from Himself, but, like Christ Himself, "what He hears," what is given Him to communicate.
he will show you things to come--referring specially to those revelations which, in the Epistles partially, but most fully in the Apocalypse, open up a vista into the Future of the Kingdom of God, whose horizon is the everlasting hills.

I have yet many things to say - Concerning my passion, death, resurrection, and the consequences of it. These things we have, not in uncertain traditions, but in the Acts, the Epistles, and the Revelation. But ye cannot bear them now - Both because of your littleness of faith, and your immoderate sorrow.