1 Corinthians 14:17-19

Amplified Bible

¹⁷ You are giving thanks well enough [in a way that God is glorified], but the other person [who does not understand you] is not edified [and spiritually strengthened since he cannot join in your thanksgiving]. ¹⁸ I thank God that I speak in [unknown] tongues more than all of you; ¹⁹ nevertheless, in public worship I would rather say five understandable words in order to instruct others, than ten thousand words in a tongue [which others cannot understand].