What is praying in tongues?

…if I pray in a tongue, my spirit prays, but my mind is unfruitful. (1 Corinthians 14:14)

The context of this verse is instruction to the church of Corinth on how to behave as a collective.  The word translated as ‘tongue’ is γλῶσσα glossa ‘language’ which means it is not a meaningless set of sounds but a structured speech with the purpose of communication.

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