1 Corinthians 14:14

James Moffatt - New Testament

For if I pray with a 'tongue,' my spirit prays, no doubt, but my mind is no use to anyone.

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For he who speaks in a 'tongue' addresses God not men; no one understands him; he is talking of divine secrets in the Spirit.

but in church I would rather say five words with my own mind for the instruction of other people than ten thousand words in a 'tongue.'

Thus a man who speaks in a 'tongue' must pray for the gift of interpreting it.