Moffatt(i)
6 Suppose now I were to come to you speaking with 'tongues,' my brothers; what good could I do you, unless I had some revelation or knowledge or prophecy or teaching to lay before you?
7 Inanimate instruments, such as the flute or the harp, may give a sound, but if no intervals occur in their music, how can one make out the air that is being played either on flute or on harp?
8 If the trumpet sounds indistinct, who will get ready for the fray?
9 Well, it is the same with yourselves. Unless your tongue utters language that is readily understood, how can people make out what you say? You will be pouring words into the empty air!