The natural man doth not receive the things of the Spirit of God, for to him they are foolishness, and he is not able to know them, because spiritually they are discerned. –1 Corinthians 2:14 (YLT)

The Spirit itself beareth witness with our spirit, that we are the children of God.  –Romans 8:16 (KJV)

Faith is the power to see into the world of spirits, into things invisible and eternal.   –John Wesley

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Thomas C. Oden, John Wesley’s Scriptural Christianity (Zondervan), pp. 118-120.

Ronald Kydd, Charismatic Gifts in the Early Church. Hendrickson Publishers, 1984.

Harold Horton, The Gifts of the Spirit. Gospel Publishing House, 1975.

Robert Graves, ed, Strangers to Fire: When Tradition Trumps Scripture.

Cecil Robeck, ed. Charismatic Experiences in History. Hendrickson Publishers, 1985.

Jeff Doles, Miracles and Manifestations, ch. 2.