Commentaries:
Adam Clarke
For if I pray in an unknown tongue - If my prayers are composed of sentences and sayings taken out of the prophets, etc., and in their own language - my spirit prayeth, my heart is engaged in the work, and my prayers answer all the purpose of prayers to myself; but my understanding is unfruitful to all others, because they do not understand my prayers, and I either do not or cannot interpret them. See the note on I Corinthians 14:19.
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