1 Corinthians 14:10

King James 3 - The Literal Traslation

So it may be many kinds of sounds are in the world, and not one is without distinct sound.

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If, then, I do not know the power of the sound, I will be a foreigner to the one speaking, and he speaking in me a foreigner.

So also you, if you do not give a clear word through the language, how will the thing being said be known? For you will be speaking into air.