Theophylact of Bulgaria
Since the Lord's words were unclear to the disciples, and they did not understand some of them while doubting most of them, He prevents them from asking again, "What commandments must we keep?" He frees them from care and confusion by saying that the Comforter will make what is unclear and hard to understand easy for you to understand. This which seems unclear to you I have said while abiding with you and being with you. But if I depart, you will be taught all things. Therefore you need not grieve over separation from Me, when it will bring you so many blessings and so much wisdom. For as long as I Myself abide with you and the Spirit has not come, you cannot understand anything great or lofty.
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He often mentions the Comforter because of the grief that held them, giving them good hope that He will guide them. The Comforter will come "in My name." This means that He will teach you nothing foreign to My teaching. He will not seek His own glory, but will come in My name, that is, for the glory of My name and not His own, as teachers hostile to one another do when they draw followers after themselves. Some understand by the words "in My name" the name of Christ, "Comforter." For it is said, "We have an Advocate, Jesus Christ" (1 Jn 2:1). And since the Spirit who came to the disciples became their Comforter and relieved their grief, He came in the name of Christ, for He too is Comforter, as Christ is. But the apostle Paul also calls the Spirit Christ when he says, "You are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in us. If anyone does not have the Spirit of Christ, he is not His" (Rom 8:9). Then he adds, "But if Christ is in you" (Rom 8:10). Do you see how he first said that the Spirit of God dwells in them, and then added, "Christ is in you"? It is clear that the apostle called the Spirit Christ. Since the Spirit is named Christ, you must understand the words, "the Father will send Him in My name," in this way: He too will be called Christ. The Holy Spirit both taught and reminded. He "taught" everything that Christ had not said to them, because they could not bear it. He "reminded" them of everything the Lord had said, but which the apostles could not retain in memory, either because of the obscurity of what was said or because of the weakness of their mind.