14:2For 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.

14:14For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.

14:15What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.

14:28But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.