1 Corinthians 14:2 in the World English Bible
For he who speaks in another language speaks not to men, but to God, for no one understands, but in the Spirit he speaks mysteries.
Context
1 Follow after charity, and desire spiritual gifts, but rather that ye may prophesy.
2 For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
3 But he that prophesieth speaketh unto men to edification, and exhortation, and comfort.