1 Corinthians 14:2

2For aone who speaks in a tongue speaks not to men but to God; for no one understands him, but he utters mysteries in the Spirit.

1 Corinthians 14:15-16

15What am I to do? I will pray with my spirit, but I will pray with my mind also; bI will sing praise with my spirit, but I will csing with my mind also. 16Otherwise, if you give thanks with your spirit, how can anyone in the position of an outsider
Or  of him that is without gifts
say eAmento fyour thanksgiving when he does not know what you are saying?

1 Corinthians 14:19

19Nevertheless, in church I would rather speak five words with my mind in order to instruct others, than ten thousand words in a tongue.

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