13 Therefore the person who speaks in another language should pray that he can interpret.
14 For if I pray in another language, my spirit prays, but my understanding is unfruitful.
15 What then? I will pray with the spirit, and I will also pray with my understanding. I will sing with the spirit, and I will also sing with my understanding.
16 Otherwise, if you praise with the spirit, how will the uninformed person say “Amen” at your giving of thanks, since he does not know what you are saying?
17 For you may very well be giving thanks, but the other person is not being built up.
18 I thank God that I speak in other languages more than all of you;
19 yet in the church I would rather speak five words with my understanding, in order to teach others also, than 10,000 words in another language.