Acts 2:5-11
Now there were dwelling in Jerusalem Jews, devout men from every nation under heaven. And at this sound the multitude came together, and they were bewildered, because each one was hearing them speak in his own language. And they were amazed and astonished, saying, “Are not all these who are speaking Galileans? And how is it that we hear, each of us in his own native language? Parthians and Medes and Elamites and residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, Phrygia and Pamphylia, Egypt and the parts of Libya belonging to Cyrene, and visitors from Rome, both Jews and proselytes, Cretans and Arabians—we hear them telling in our own tongues the mighty works of God.”
I have many Chinese friends that have known me for many years. They know that I don't speak Chinese. If I could suddenly be fluent in Chinese by the power of God, they would be in awe of the miracle and believe in God's power.
1 Corinthians 14:6
Now, 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?
On the positive side, I do have revelation, knowledge, prophecy and teaching to share; but I want to communicate with unbelievers in their own language. Wouldn't that make me a true, full-spectrum Apostolic believer?
1 Corinthians 14:22
Thus tongues are a sign not for believers but for unbelievers, while prophecy is a sign not for unbelievers but for believers.