1 Corinthians 14:7

'Even things without life, giving a voice (noise), whether pipe or harp, if they give not a distinction in the sounds, how shall it be known what is piped or harped?'

Let them consider the example of worldly things which make noises. Even though they are without life we still expect them to make intelligible noises. If they play sounds which are not distinctive who will know what is being conveyed? The player must ensure that the music he produces is meaningful to the hearer. The inference is that we who have life and are intelligent should ensure that we make noises in public that are intelligible, whereas there is nothing in tongues that can be distinguished by men, and from which they can themselves benefit.