Can I share a story? I have a theory, based on years of observing and hearing private prayer tongues from all races, sexes, etc. I believe it is the pure unadulaterated language spoken pre-towel of Babel. No matter where I am at, the actual words sound the same when someone is caught up in the spirit during their prayers where the holy Spirit takes over their moanings and groanings. Perry Stone, a known evangelical minister with various prophetic gifts, etc, was at a local college that I had attended. The service had not yet begun. An elderly couple was sitting on the front role with a recording device. Perry Stone was on the stage, over to the side, praying next to the curtain. They had already switched on the recorder and it picked up his prayer, in tongues. After the service, they were listening to it and thought it was interesting that Perry had not used English. They took it to a language professor who listened and asked "Where did you get this?" He declared that what he was hearing was an ancient language no longer used in this world that he knew of, and got very excited. He could translate most of it and it was a sincere message of hope and encouragement from a Godly source.
Another reason I have this theory is that I was online in a private chat, praying with a dear minister's wife, a saintly holy spirit filled person. As we were typing, she went into prayer tongues. What occured went into hyper speed and my screen was filled with this ever flowing language that was beautiful to see and behold, although I could not understand it. The wording looked like some ancient navaho or language that was not filled with huge words. I wish that I had thought of printing it out but I was so amazed at "seeing' tongues". My friend was not aware that it was happening at all on my screen. Her speed, the agility and the sudden flow of wording had to be Supernatural. Yes, it edified her and and was a blessing to me. She did not have to translate this, because it was the Holy Spirit taking her meakly, humbled words from her heart directly to the throneroom of GOD Himself. God was showing me just another mystery, a growth moment that I will never forget.