Is proof for unbelievers. This is the real point of the quotation in 1 Corinthians 14:21. Those who will not be taught by God through understandable language, will become fixed in their unbelief and even justified, by the speaking in strange tongues. [Lipscomb, et. al., takes this to be a proof to unbelievers in the sense of Acts 2:5-13. But Paul wants to restrain, rather than stimulate, the use of strange tongues at Corinth.]

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Old Testament