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The Holy Spirit is not an apparition, floating about here and there and manifesting Himself in mysterious, now-you-see-Him, now-you-don't manner.... The Holy Spirit is the living personhood of God.... the full personality of God resident in us as believers.

1 CORINTHIANS 2:11

Who among men knows the thoughts of a man except the spirit of the man which is in him? Even so the thoughts of God no one knows except the Spirit of God.