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 16:22, what should be done with those who don't love Jesus?
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.