Yet 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? For if (A)the trumpet produces an indistinct sound, who will prepare himself for battle? So you too, unless you produce intelligible speech by the tongue, how will it be known what is spoken? For you will just be (B)talking to the air.

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