What is the TRUTH about speaking in TONGUES

This message will clarify where i stand, regarding this very complicated issue that divides many Christians!
It should NOT divide if the Bible would be studied properly and ALWAYS with english -greek koine interlinear!
But, the pentecostal-charismatic movement is very powerful and influent and they will do their best to push this NO MATTER what.
So, whats the TRUTH about SPEAKING IN TONGUES?
Lets see