John 14:16-18

Verse 16

I will pray the Father - After having made an atonement for the sin of the world, I will become the Mediator between God and man; and through my mediation and intercession shall all the blessings of grace and glory be acquired.

Another Comforter - The word παρακλητος signifies not only a comforter, but also an advocate, a defender of a cause, a counsellor, patron, mediator. Christ is thus termed, 1Jn 2:1, where the common translation renders the word advocate. Christ is thus called, because he is represented as transacting the concerns of our souls with God; and for this cause, he tells us, he goes unto the Father, Joh 14:12. The Holy Spirit is thus called, because he transacts the cause of God and Christ with us, explains to us the nature and importance of the great atonement, shows the necessity of it, counsels us to receive it, instructs us how to lay hold on it, vindicates our claim to it, and makes intercessions in us with unutterable groanings. As Christ acted with his disciples while he sojourned with them, so the Holy Ghost acts with those who believe in his name.

For ever - As the death and atonement of Christ will be necessary to man till the conclusion of the world, so the office of the Holy Spirit must be continued among men till the end of time: therefore says Christ, he shall continue with you for ever, teaching, comforting, advising, defending, and interceding for you and for all my followers to the end of time.
Verse 17

The Spirit of truth - The Spirit, or Holy Ghost, whose essential office is to manifest, vindicate, and apply the truth. The Gospel of Christ may be thus called, because it exposes falsity, removes error, and teaches the knowledge of the true God - shows the way to him, saves from vanity and illusive hopes, and establishes solid happiness in the souls of those who believe.

The world cannot receive - By the world, St. John means those who are influenced only by the desire of the flesh, the desire of the eye, and the pride of life, 1Jn 2:16. Now these cannot receive the Spirit of the truth, because they see him not, have no spiritual discernment, attend to nothing but the dictates of their corrupt passions and affections, and will admit of no influence but what can be an object of their senses. Hence all the deign and irreligion in the world. God, in the operation of his hands, and in the influences of his Spirit, is found every where except in the perverted passions of men. In these alone do men of corrupt minds seek him; here only he is not to be found, and therefore they become infidels and atheists.

But ye know him - Ye have already received a measure of the truth, and ye believe in this Spirit. Probably our Lord refers to the knowledge which they should afterwards attain: in this sense the passage has been understood by the Vulgate, Nonnus, and two copies of the Itala, which read, Ye Shall know him.

For he dwelleth with you - Or, as the Ethiopic, Vulgate, Nonnus, and six copies of the Itala read, he shall dwell with you, (see above); and this, it is very evident, is the meaning of the evangelist, who not unfrequently uses the present for the future tense. It is certain the Holy Spirit was not yet given to the disciples so as to dwell in them; this St. John himself assures us, Joh 7:39. And it is evidently of that Spirit and its influences, which was not given till the day of pentecost, that our Lord here speaks.
Verse 18

I will not leave you comfortless - Literally, orphans. The original word ορφανος, is by some derived from ορφνος, obscure, dark, because, says Mintert, an orphan (one deprived of father and mother) is little esteemed, neglected, and is obliged to wander about in obscurity and darkness. Others derive it from the Hebrew חרף charaph, to strip or make bare, despoil, because such a child is destitute of comfort, direction, and support, and is a prey to misery and disease, to sin and to death.

The disciples of a particular teacher among the Hebrews called him father; his scholars were called his children, and, on his death, were considered as orphans. Christ calls his disciples children, beloved children, Joh 13:33; and, now that he is about to be removed from them by death, he assures them that they shall not be left fatherless, or without a teacher; for in a little time he should come again, (rise from the dead), and, after his ascension, they should be made partakers of that Spirit which would be their comforter, advocate, teacher, and guide for ever.
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