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He that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him. 14:2
Trivia: According to 1 Corinthians 12:31, what should you covet?
Paul says that the other apostles traveled with their wives - including Peter. We know from Mark 1:30 that Peter had a wife, since Jesus cured his mother-in-law. Paul confirms Peter's marital status here.