What Are the Tongues in 1 Corinthians? - Part 2 — Ekkehardt Mueller

What was the nature of the tongues Paul mentioned in his first letter to the Corinthians? How can we know that the tongues in 1 Corinthians refer to real languages? 
What Are the Tongues in 1 Corinthians? - Part 2 — Ekkehardt Mueller
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