William Henry wrote an interesting book of the same title of this thread. His work has an esoteric bent and a focus on symbolism.

He may or may not agree, but the language can be spoken aloud and it doesn't sound anything like "speaking in tongues". Sounds a bit like Sumerian but I do not know how to write it down; it's more of Iike speaking from the heart rather than the mind. I suppose it can be written with geometry. The thing is, writing is connected with the mental faculty and in speaking it, it flows with such beauty I could not describe to you in the written word.

Thanks for posting this. When I realized the mystery language I can speak is connected to this, I've been trying to learn more. I think it's the language we used to communicate before all other root languages and their dialects.