So if the whole church comes together and everyone speaks in tongues, and inquirers or unbelievers come in, will they not say that you are out of your mind? (I Corinthians 14:23 NASB)
In this verse the Apostle Paul warns of the practical effects of the use/ overuse of tongues in church. Paul has previously argued that tongues should only be used sparingly in church, and then only if they are clearly interpreted into common language. But if there are lots of people in church speaking in gibberish with no interpretation, then there is chaos and God is not being glorified. If unbelievers come in to observe what is going on they will be scared off by the crazy scene. Even if they decide to stay and join in raucous, it will not be for the right reasons. The church needs to bring in new converts who are looking for truth, not those who are just looking for an emotional outlet. The Gospel message can only save souls if it is clearly preached in words that are easily understood.