6Now, 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? 7Even in the case of lifeless instruments, such as the flute or harp, how will anyone recognize the tune they are playing unless the notes are distinct? 8Again, if the trumpet sounds a muffled call, who will prepare for battle? 9So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air. 10Assuredly, there are many different languages in the world, yet none of them is without meaning. 11If, then, I do not know the meaning of someone’s language, I am a foreigner to the speaker, and he is a foreigner to me. 12It is the same with you. Since you are eager to have spiritual gifts, strive to excel in gifts that build up the church. 13Therefore, the one who speaks in a tongue should pray that he may interpret. 14For if I pray in a tongue, my spirit prays, but my mind is unfruitful. 15What then shall I do? I will pray with my spirit, but I will also pray with my mind. I will sing with my spirit, but I will also sing with my mind. 16Otherwise, if you speak a blessing in spirit, how can someone who is uninstructed say “Amen” to your thanksgiving, since he does not know what you are saying? 17You may be giving thanks well enough, but the other one is not edified. 18I thank God that I speak in tongues more than all of you. 19But in the church, I would rather speak five coherent words to instruct others than ten thousand words in a tongue. 20Brothers, stop thinking like children. In regard to evil be infants, but in your thinking be mature. 21It is written in the Law: “By strange tongues and foreign lips I will speak to this people, but even then they will not listen to Me, says the Lord.” 22Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers. 23So if the whole church comes together and everyone speaks in tongues, and some who are uninstructed or some unbelievers come in, will they not say that you are out of your minds? 24But if an unbeliever or uninstructed person comes in while everyone is prophesying, he will be convicted and called to account by all, 25and the secrets of his heart will be made known. So he will fall facedown and worship God, proclaiming, “God is truly among you!” 26What then shall we say, brothers? When you come together, everyone has a psalm or a teaching, a revelation, a tongue, or an interpretation. All of these must be done to build up the church. 27If anyone speaks in a tongue, two, or at most three, should speak in turn, and someone must interpret. 28But if there is no interpreter, he should remain silent in the church and speak only to himself and God. 29Two or three prophets should speak, and the others should weigh carefully what is said. 30And if a revelation comes to someone who is seated, the first speaker should stop. 31For you can all prophesy in turn so that everyone may be instructed and encouraged. 32The spirits of prophets are subject to prophets. 33For God is not a God of disorder, but of peace—as in all the churches of the saints.