1 Corinthians 14:2, 14
1 Corinthians 14:2 ASV
For he that speaketh in a tongue speaketh not unto men, but unto God; for no man understandeth; but in the spirit he speaketh mysteries.
1 Corinthians 14:14 ASV
For if I pray in a tongue, my spirit prayeth, but my understanding is unfruitful.