1 Cor 14:13 Therefore let one who speaks in a tongue pray that he may interpret. For if I pray in a tongue, my mind is unfruitful.
Tongues is primarily for the person with the gift!!
Our mind doesn't know how to pray like we should, so it is valuable to have the Spirit help us with our prayers. Still it seems pretty obvious that I might get some benifit from knowing what I am saying - right.
Getting and interpretation is as simple as asking the Lord what it is you are praying and listening to His small voice for the answer!!!
He sometimes tells me generalization - like "You are praying for this person", sometimes He gives me a word for word translation as if I had an interpreter, and sometimes I get a download like an awareness of the overall meaning.
Now I can pray tongues quitely inside, just like I can talk to God quitely inside. What purpose is there for interupting a service with a bunch of people all talking at the same time? Even if they were all speaking in english at the same time it would be silly. Paul discusses the obvious confusion that can come from that. They are simply going to think we are all crazy. We want unbelievers showing up at our churches, so that they might become believers, so it seems pretty obvious that churches shouldn't just have everybody start praying in tongues.
Still there are times when a group, even a larger group, of believers get together, and it becomes obvious that the Spirit is moving the group. Maybe its a conference or retreat, where the purpose is not about bringing in new believers, but rather its more about a refreshing of the body.Then perhaps you get singing in tongues and other wonderful manifestations of the Spirit.
And certainly if I am with a small intimate group of intercessors, I expect the others to be praying in tongues, and even when someone else might be praying in english. In the same way, I might be talking to the Lord (agreeing, adding to, or trying to get other information like instructions for my prayer) while someone else is praying. It doesn't bother me that others pray in tongues. It's good not bad so long as it does not interrupt, or drive away unbelievers.
Paul was just reviewing the obvious in the Scriptures. Somes seem to get so legalistic that they miss the whole point. Tonges is a gift the Spirit gives to help the individual pray better!
Perhaps there is some little variation that the Spirit might use. For the sake of a unbeliever, He might want to have one person pray in tongues and have another give the interpretation. Perhaps the Spirit might want to give a person words in another spoken language in the world which another person might know but not the person speaking it. Those type of things are wonderful sign that God exists, but are not the prime uses of tongues.
The prime use for me is to help me pray better, and remind me to listen to His small voice. Which happens when I ask for an interpretation whenever I pray in tongues.
1 Cor 14:21 "By men of strange tongues and by the lips of strangers I will speak to this people, and even so they will not listen to Me," says the Lord
So if you are speaking in tongues, but are not seeking His voice (praying for an interpretation), doesn't that verse apply to you? Shouldn't the person speaking in tongues be the first to realize that they themselves are not listening to the small voice of our Lord?
So when I need help praying, it's good that I have the gift of tongues to help me pray as I should, but when I am around others that need to be ministered to it is better that I hear what the Spirit has to say in words I can tell them.
1 Cor 14:18 I thank God, I speak in tongues more than you all; however, in the church I desire to speak five words with my mind so that I may instruct others also, rather that ten thousand words in a tongue.
Now let me ask a question. If somebody speaks in tongues at the general assembly at church, who should interpret since it is written "let one who speaks in a tongue pray the he may interpret"?
1 Cor 14:27 If anyone speaks in a tongue, it should be by two or at most three, and each in turn, and one must interpret.
So many people seem to think that one person should speak in tongues and a different person should interpret. Yet if the one who speaks in tongue is supposed to pray for the interpretation, then it is the one who speaks in tongues who should more than likely have the interpretation.
And consider this: Since you can pray silently, you can pray silently in tongues, get the interpretation, and then just give the interpretation (word) out loud. Still ask the Lord, listen to Him, and do it how He wants it done!
1 Cor 14:29 Let two or three prophets speak, and let the others pass judgment... (14:31) for you can all prophesy one by one, so that all may learn...
His sheep hear His voice, so all His sheep can get a word from Him and give it in turn.