1 Cor 14:9 So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air.
Speak intelligible words with you tongue not "interpret your un-intelligible words that you speak with your tongue.
5) 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.
13) Wherefore let him that speaketh in an unknown tongue pray that he may interpret.
27) If any man speak in an unknown tongue, let it be by two, or at the most by three, and that by course; and let one interpret.
There can not be any edification where there's no understanding, you can't explain how.
1 Cor 14:
4) He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.