For the person who speaks in another language is not speaking to men but to God, since no one understands him; however, he speaks mysteries in the Spirit.

But now, brothers, if I come to you speaking in other languages, how will I benefit you unless I speak to you with a revelation or knowledge or prophecy or teaching?

In the same way, unless you use your tongue for intelligible speech, how will what is spoken be known? For you will be speaking into the air.