1 Corinthians 14:4-8

The one who speaks in a tongue builds up himself, but the one who prophesies builds up the church. Now I want you all to speak in tongues, but even more to prophesy. The one who prophesies is greater than the one who speaks in tongues, unless someone interprets, so that the church may be built up. Now, brothers, if I come to you speaking in tongues, how will I benefit you unless I bring you some revelation or knowledge or prophecy or teaching? If even lifeless instruments, such as the flute or the harp, do not give distinct notes, how will anyone know what is played? And if the bugle gives an indistinct sound, who will get ready for battle?