1 Corinthians 14:1

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.

But he that prophesieth speaketh unto men to edification, and exhortation, and comfort.

He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.

I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying.