1 Corinthians 14:15-19

So what should I do? I will pray with my spirit, but I will also pray with my mind. I will sing with my spirit, but I will also sing with my mind. If you praise God with your spirit, those persons there without understanding cannot say amen to your prayer of thanks, because they do not know what you are saying. You may be thanking God in a good way, but the other person is not helped. I thank God that I speak in different kinds of languages more than all of you. But in the church meetings I would rather speak five words I understand in order to teach others than thousands of words in a different language.