The meaning of the voice - Of the language that is uttered, or the sounds that are made.

I shall be unto him ... - What I say will be unintelligible to him, and what he says will be unintelligible to me. We cannot understand one another any more than people can who speak different languages.

A barbarian - See the note at Romans 1:14. The word means one who speaks a different, or a foreign language.

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