It is because the presence of the Spirit as the indwelling teacher in every believer is so little known and recognized in the Church, and because, as the result of this, the workings of the Spirit are greatly limited, and, there is so much difficulty and doubt, so much fear and hesitation about the recognition of the virtues of the Spirit.This spiritual incertitude, these hazy Christian experiences and weakening and distressing doubts in respect to fundamentals — the truth of Christ and personal salvation through Him — are the natural product of nebulous preaching on the subject of the offices of the Holy Spirit. This defective preaching comes from a negative experience of the fulness of the Spirit.
Conversions take the type of doctrines. The Wesleys, after a long and painful search, received the direct witness of the Spirit to the forgiveness of sins. They immediately began to preach this doctrine, strange to that era of spiritual death, though shining in the New Testament as clearly as the midday sun. People were converted by thousands, of whom John Wesley testified that ninety-nine out of every hundred could tell the exact time of their saving acceptance of Christ.
This is not the ratio of clear-cut conversions with a date among modern Methodists, because the offices of the Holy Spirit are not now so prominently and constantly held up before the people in the ministrations of the pulpit. What is the remedy? Let the pulpit be baptized with the Holy Ghost. Let preacher and layman who desire to know the promised Paraclete and to realize His indwelling, study the teaching of the Bible on this theme, especially the promises in the fourth Gospel. Gather these promises together and study them earnestly, and then turn to the Pentecostal fulfillment in the Acts, and to the full development and application of this doctrine by the apostolic writers, especially John and Paul. Approach these epistles athirst to find the artesian well of "waters springing up unto everlasting life," and to drink evermore therefrom. Study prayerfully and with faith all that the Spirit of inspiration has put on record respecting Himself and His indwelling and blessed work in your heart. Study in dependence on the Spirit, who alone can unlock the Word that He has inspired. Study with a will to follow whither the Spirit may lead, and with a complete self-surrender to God and that perfect self-effacement which Paul describes as a double crucifixion, "the world has been crucified unto me, and I unto the world" (Gal. vi. 14). Consecration is indispensable to the successful study in this high theme. It clarifies the intellect, dispels prejudices and misconceptions, and unifies and strengthens all the faculties.
In this attitude of hearty consent to the leading of the Spirit, obedience to Christ and crucifixion of the flesh, the persevering believer will soon find the Spirit working in him, first as a search-light revealing impurities and mixed motives never discovered before. Then, if the will consents to their removal, the Spirit will entirely cleanse the temple of the heart and permanently fill it with His glorious presence. He will beautify His sanctuary with the entire galaxy of Christian virtues. He will strengthen its walls and make them impregnable to all assaults from without, and He will insure loyalty within by His constant indwelling "who yearneth for us even jealously" (James iv. 5, Revised Version, margin). We must remember that in both the natural and the spiritual world knowledge is preceded by faith. We must believe the Holy Ghost before we can know Him. Every altitude of higher knowledge must be the result of a stronger trust. Faith must be the habit of the soul that aspires after constant growth. Faith ever has to do with the invisible and the seemingly unreal. The Paraclete is unseen to the natural eye, and the inner eye of reason does not recognize His existence. Hence faith is the only door for the Spirit to enter and the only atmosphere in which He can dwell. There is no way of knowing the Holy Spirit but by possessing Him and being possessed by Him, just as there is no way of knowing life but by living. In fact the Holy Spirit is the life of the believing human spirit. The spiritual life is as real to consciousness as the natural life.
— from The Gospel of the Comforter, Chapter 22.