1 Corinthians 14:9-11
New American Bible (Revised Edition)
9 Similarly, if you, because of speaking in tongues, do not utter intelligible speech, how will anyone know what is being said? For you will be talking to the air. 10 It happens that there are many different languages in the world, and none is meaningless; 11 but if I do not know the meaning of a language, I shall be a foreigner to one who speaks it, and one who speaks it a foreigner to me.
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