The unbeliever does not welcome what comes from God’s Spirit, because it is foolishness to him; he is not able to understand it since it is evaluated spiritually. –1 Corinthians 2:14 (HCSB)

You are deceived, because you don’t know the Scriptures or the power of God. –Matthew 22:29 (HCSB)

The Spirit himself testifies with our spirit that we are God’s children. –Romans 8:16

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I was fully convinced of what I had long suspected, 1. That the Montanists, in the second and third centuries, were real, Scriptural Christians; and, 2. that the grand reason why the miraculous gifts were so soon withdrawn, was not only that faith and holiness were well nigh lost; but that dry, formal, orthodox men began even then to ridicule whatever gifts they had not themselves, and to decry them all as either madness or imposture. –John Wesley, Journal, August 15, 1750

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John Sherrill, They Speak with Other Tongues.

Don Basham, A Handbook on Holy Spirit Baptism.

—. Spiritual Power.

—. A Handbook on Tongues, Interpretation, and Prophecy.

Harold Horton, The Gifts of the Spirit.

French Arrington, Christian Doctrine, volume 3, part 1. (official Church of God theology).