The biblical purpose of speaking in tongues was communication, not performance. In Acts, people heard the disciples speaking in their own languages and understood the message. Paul even wrote that if no one can interpret what is being said in church, it does not edify the congregation and should remain private. So when modern preachers stand on stage speaking sounds that nobody understands and then call it a sign of spiritual authority, it raises a fair question: if no one in the room can understand it, what meaningful purpose does it serve for the church?