1 Corinthians 14:7-8; 1 Corinthians 14:10-11

7 Yet even lifeless things, either 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? 8 For if the bugle produces an indistinct sound, who will prepare himself for battle?
10 There are, perhaps, a great many kinds of languages in the world, and no kind is without meaning. 11 If then I do not know the meaning of the language, I will be to the one who speaks a barbarian, and the one who speaks will be a barbarian to me.
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