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If I know not the meaning of the voice - Την δυναμιν της φωνης, The power and signification of the language.

I shall be unto him that speaketh a barbarian - I shall appear to him, and he to me, as a person who had no distinct and articulate sounds which can convey any kind of meaning. This observation is very natural: when we hear persons speaking in a language of which we know nothing, we wonder how they can understand each other, as, in their speech, there appears to us no regular distinction of sounds or words. For the meaning and origin of the word barbarian, see the note on Acts 28:2.

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.

Even an apostle could not edify, unless he spoke so as to be understood by his hearers. To speak words that have no meaning to those who hear them, is but speaking into the air. That cannot answer the end of speaking, which has no meaning; in this case, speaker and hearers are barbarians to each other. All religious services should be so performed in Christian assemblies, that all may join in, and profit by them. Language plain and easy to be understood, is the most proper for public worship, and other religious exercises. Every true follower of Christ will rather desire to do good to others, than to get a name for learning or fine speaking.