It is to be explained in part, of course, by the Resurrection of Christ from the dead, but mainly--and this is the fact with which just now we are concerned--by the gift of the Holy Spirit whom Christ had promised to His disciples to abide with them for ever. But now, what do we mean when we speak of the gift of the Holy Spirit? What is the Holy Spirit, and what is it that He does for us? Many of us, I think, must have felt how extremely unreal, and therefore unsatisfying, the discussions of this great subject often are. The doctrine somehow fails to find a place among the proved realities of our Christian experience. It remains, so to speak, outside of us, a foreign substance which life has not assimilated. And hence it has come to pass that there is no small danger to-day lest New Testament phrases about being filled with the Spirit, baptized with the Spirit, and so forth, become the mere jargon of a school which wholly fails to interpret the mind of Christ. Doubtless there are faults on both sides, the faults of neglect and the faults of false emphasis, and for both the true remedy is a more careful study of the teaching of Jesus. What, then, is the Holy Spirit, and what is it He does for us? "I will pray the Father," Christ said, "and He shall give you another Comforter," or "another Paraclete." The word translated "Comforter," which occurs so often in this discourse of our Lord, is found nowhere else in the New Testament except in the First Epistle of St. John, where it is rendered "Advocate"; "If any man sin, we have an Advocate with the Father, Jesus Christ, the righteous." And this, without doubt, is a more faithful rendering of the word which Christ used than the more familiar "Comforter." An advocate is one who is called to our side to be our friend and helper, more especially to plead our cause in a court of justice; and this also is the meaning of the word "Paraclete." Perhaps, however, the word "Comforter" may be retained without loss, if only we remember to give it its full and original meaning. To "comfort" is not primarily and originally to console, but to strengthen, to _fort_ify; and the "Comforter" whom Christ promised to His disciples was not only one who should soothe them in their sorrows, but should stand by them in all their conflicts, their unfailing friend and helper.