For if I pray in a tongue, my spirit prays, but my mind is unfruitful.
Therefore anyone who speaks in a tongue should pray for the ability to interpret what he says.
Nevertheless, in church I would rather speak five words with my mind to instruct others, than ten thousand words in a tongue.
For he who speaks in a tongue speaks not to men but to God; for no one understands him, but he speaks mysteries in the Spirit.