The importance of the "Spirit giving utterance" is paramount. There are many religions even today that profess to speaking in tongues. They are initially uttered as a steady flow of babel/gibberish and eventually become a secretive spiritual language between you and the Spirit. This however is another's ethnically/nationally derived language being used by the Spirit to communicate to that other person in their native tongue through an untaught medium. Much different - impossible if not by the Spirit. The text here is clear.
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