14:12-17 Whatever we ask in Christ's name, that shall be for our good, and suitable to our state, he shall give it to us. To ask in Christ's name, is to plead his merit and intercession, and to depend upon that plea. The gift of the Spirit is a fruit of Christ's mediation, bought by his merit, and received by his intercession. The word used here, signifies an advocate, counsellor, monitor, and comforter. He would abide with the disciples to the end of time; his gifts and graces would encourage their hearts. The expressions used here and elsewhere, plainly denote a person, and the office itself includes all the Divine perfections. The gift of the Holy Ghost is bestowed upon the disciples of Christ, and not on the world. This is the favour God bears to his chosen. As the source of holiness and happiness, the Holy Spirit will abide with every believer for ever.
8-12. The substance of this passage is that the Son is the ordained and perfect manifestation of the Father, that His own word for this ought to His disciples to be enough; that if any doubts remained His works ought to remove them (see on Joh 10:37); but yet that these works of His were designed merely to aid weak faith, and would be repeated, nay exceeded, by His disciples, in virtue of the power He would confer on them after His departure. His miracles the apostles wrought, though wholly in His name and by His power, and the "greater" works—not in degree but in kind—were the conversion of thousands in a day, by His Spirit accompanying them.