1 Corinthians 14:10

New King James Version

There are, it may be, so many kinds of languages in the world, and none of them is without significance.

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So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air.

Therefore, if I do not know the meaning of the language, I shall be a foreigner to him who speaks, and he who speaks will be a foreigner to me.