1 Corinthians 14:18-20

New King James Version

¹⁸ I thank my God I speak with tongues more than you all; ¹⁹ yet in the church I would rather speak five words with my understanding, that I may teach others also, than ten thousand words in a tongue.

Tongues a Sign to Unbelievers

²⁰ Brethren, ^(A)do not be children in understanding; however, in malice ^(B)be babes, but in understanding be mature.