Anyone who speaks in a tongue does not speak to people but to God

 1 Corinthians 14:1-20

For anyone who speaks in a tongue does not speak to people but to God. Indeed, no one understands them; they utter mysteries by the Spirit. But the one who prophesies speaks to people for their strengthening, encouraging and comfort. Anyone who speaks in a tongue edifies themselves, but the one who prophesies edifies the church.

So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air. 

For this reason the one who speaks in a tongue should pray that they may interpret what they say. 

I thank God that I speak in tongues more than all of you. But in the church I would rather speak five intelligible words to instruct others than ten thousand words in a tongue.

Why?

Paul had explained very clearly that a tongue does not speak to people but to God.

One who prophesies edifies the church, for everyone understands what he says.

If it is interpreted, what they say in tongues is good to everyone.

But most time, people in public speak in tongues to earn respect or personal honor.

How?

Follow the instructions of Paul and the word of the Lord is benefit to every Christian.