1 Corinthians 14:14-16
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14For if I pray in a tongue, my spirit prays, but my mind is unproductive. 15What is the outcome then? I will pray with the spirit, but I will pray with the mind also; I will sing with the spirit, but I will sing with the mind also. 16For otherwise, if you bless God in the spirit only, how will the one who occupies the place of the outsider know to say the “Amen” at your giving of thanks, since he does not understand what you are saying?