The Apostle Paul lists speaking in tongues and interpreting tongues as manifestations of the Holy Spirit.
The book of Acts records an account of people miraculously speaking foreign languages which they have not learned.
The Apostle Paul seems to describe people speaking in languages that are not a known human language, yet are interpreted by themselves or someone else and that contain a message from God.
Paul also seems to talk about people speaking or praying in unknown languages that somehow are spiritual languages through which their spirit communicates directly to God.
Read and Watch stories about tongues here.
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