(3) The Nature of the Spirit.—The apostles never discuss the nature of the Holy Spirit in any thoroughly systematic way. But two great facts are really presupposed in the whole New Testament. In the first place, the Holy Spirit is God, and in the second place he is a person distinct from the Father and from the Son. The divinity of the Spirit appears, for example, in I Cor. 2:11. The point of that verse is that the Spirit is as closely related to God as the human spirit is to a man. "For who among men knoweth the things of a man, save the spirit of the man, which is in him? even so the things of God none knoweth, save the Spirit of God." The distinct personality of the Spirit appears with special clearness in Rom. 8:26, 27. There the Spirit is represented as making intercession with him "that searcheth the hearts"; the one who intercedes is personally distinct from him before whom he makes intercession. Even more convincing, perhaps, is the great promise of Christ in John 14:16, 17, 26; 15:26; 16:7-15, where the other "Comforter" is spoken of in clearly personal terms and is distinguished both from the Father and from the Son. Personal distinctness, however, is not inconsistent with a perfect unity of nature. What the Spirit does the Son and the Father do; when the other Comforter comes to the Church, Christ himself comes. The doctrine of the "Trinity" is a profound mystery, but its mysteriousness is no obstacle to the acceptance of its truth. Mystery in the depths of God's nature is surely to be expected. This mystery, taught by the pen of inspired writers, has brought salvation and peace into the lives of men. Distinctly Trinitarian passages, such as Matt. 28:19; II Cor. 13:14, are merely the summation of the New Testament teaching about God, and that teaching has worked itself out in unspeakable blessing in the life of the Church.
(4) The Work of the Spirit.—A complete summary of the belief of the apostolic Church about the work of the Holy Spirit would be impossible in one brief lesson. The Christian life is begun by the Spirit, and continued by his beneficent power. Conversion, according to Jesus and his apostles, is only the manward aspect of a profound change in the depths of the soul. That change is "regeneration," a new birth. Christian experience is no mere improvement of existing conditions, but the entrance of something entirely new. Man is not merely sick in trespasses and sins, but "dead"; only a new birth will bring life. That new birth is a mysterious, creative act of the Spirit of God. John 3:3-8.
But the Spirit does not leave those whom he has regenerated to walk alone; he dwells in them and enables them to overcome sin. The motive of his work is love. He is no blind force, but a loving Person; the Christian can enjoy a real communion with him as with the Father and the Son. In the presence of the Spirit we have communion with God; the Persons of the Godhead are united in a manner far beyond all human analogies. There is no imperfect medium separating us from the divine presence; by the gracious work of the Holy Spirit we come into vital contact with the living God.
The Spirit is the ground and cause of Christian freedom. "Where the Spirit of the Lord is, there is liberty." II Cor. 3:17. "For as many as are led by the Spirit of God, these are sons of God. For ye received not the spirit of bondage again unto fear; but ye received the spirit of adoption, whereby we cry, Abba, Father." Rom. 8:14, 15. This liberty that the Spirit brings is, however, not a liberty to sin; it is liberation from sin. The body of the Christian is a temple of the Holy Spirit; in that temple only purity is in place. The inward power of the Holy Spirit in the heart is more powerful than the law; if a man yields to that power he will overcome the flesh; the law of God is fulfilled by those "who walk not after the flesh, but after the Spirit."
In the Library.—Vos, "The Teaching of Jesus Concerning the Kingdom of God and the Church." Crane, "The Teaching of Jesus Concerning the Holy Spirit." Swete, "The Holy Spirit in the New Testament." Thomas, "The Holy Spirit of God."