5I wish all of you spoke in other tongues, but even more that you prophesied. The person who prophesies is greater than the person who speaks in tongues, unless he interprets so that the church may be built up.
6So now, brothers and sisters, if I come to you speaking in other tongues, how will I benefit you unless I speak to you with a revelation or knowledge or prophecy or teaching?
7Even lifeless instruments that produce sounds--whether flute or harp--if they don't make a distinction in the notes, how will what is played on the flute or harp be recognized?
15What then? I will pray with the spirit, and I will also pray with my understanding. I will sing praise with the spirit, and I will also sing praise with my understanding.
21It is written in the law, I will speak to this people by people of other tongues and by the lips of foreigners, and even then, they will not listen to me, says the Lord.
22Speaking in other tongues, then, is intended as a sign, not for believers but for unbelievers, while prophecy is not for unbelievers but for believers.
23If, therefore, the whole church assembles together and all are speaking in other tongues and people who are outsiders or unbelievers come in, will they not say that you are out of your minds?
26What then, brothers and sisters? Whenever you come together, each one has a hymn, a teaching, a revelation, another tongue, or an interpretation. Everything is to be done for building up.