1 Corinthians 14.6-19 (Epistle)
6But now, brothers, if I come to you speaking with other languages, what would I profit you unless I speak to you either by way of revelation, or of knowledge, or of prophesying, or of teaching? 7Even lifeless things that make a sound, whether pipe or harp, if they didn’t give a distinction in the sounds, how would it be known what is piped or harped? 8For if the trumpet gave an uncertain sound, who would prepare himself for war? 9So also you, unless you uttered by the tongue words easy to understand, how would it be known what is spoken? For you would be speaking into the air. 10There are, it may be, so many kinds of languages in the world, and none of them is without meaning. 11If then I don’t know the meaning of the language, I would be to him who speaks a foreigner, and he who speaks would be a foreigner to me. 12So also you, since you are zealous for spiritual gifts, seek that you may abound to the building up of the assembly.
13Therefore let him who speaks in another language pray that he may interpret. 14For if I pray in another language, my spirit prays, but my understanding is unfruitful.
15What should I do? I will pray with the spirit, and I will pray with the understanding also. I will sing with the spirit, and I will sing with the understanding also. 16Otherwise, if you bless with the spirit, how will he who fills the place of the unlearned say the “Amen” at your giving of thanks, seeing he doesn’t know what you say? 17For you most certainly give thanks well, but the other person is not built up. 18I thank my God, I speak with other languages more than you all. 19However, in the assembly I would rather speak five words with my understanding, that I might instruct others also, than ten thousand words in another language.