1 Corinthians 14:7-12

7Yet even lifeless instruments, whether flute or harp, in producing a sound, if they do not produce a distinction in the tones, how will it be known what is played on the flute or on the harp? 8For if 1the trumpet produces an indistinct sound, who will prepare himself for battle? 9So you too, unless you produce intelligible speech by the tongue, how will it be known what is spoken? For you will just be 2talking to the air. 10There are, perhaps, a great many kinds of 3languages in the world, and none is incapable of meaning. 11So if I do not know the meaning of the language, I will be 4unintelligible to the one who speaks, and the one who speaks will be unintelligible 5to me. 12So you too, since you are eager to possess 6spiritual gifts, strive to excel for the 7edification of the church.