21. In the Law it is written, "Through people who speak unfamiliar languages and through the lips of strangers I will speak to these people. But even then they will not listen to me." (Isaiah 28:11,12) That is what the Lord says.
22. So speaking in other languages is a sign for those who don't believe. It is not a sign for those who do believe. But prophecy is for believers. It is not for those who don't believe.
23. Suppose the whole church comes together and everyone speaks in other languages. And suppose visitors or unbelievers come in. Won't they say you are out of your minds?
24. But suppose unbelievers or visitors come in while everyone is prophesying. Then they will be shown by all who speak that they are sinners. They will be judged by all.