Bible: 1 Corinthians 14:6-19
14:6 Now, brothers and sisters, 1 if I come to you speaking in tongues, how will I help you unless I speak to you with a revelation or with knowledge or prophecy or teaching? 14:7 It is similar for lifeless things that make a sound, like a flute or harp. Unless they make a distinction in the notes, how can what is played on the flute or harp be understood? 14:8 If, for example, the trumpet makes an unclear sound, who will get ready for battle? 14:9 It is the same for you. If you do not speak clearly with your tongue, how will anyone know what is being said? For you will be speaking into the air. 14:10 There are probably many kinds of languages in the world, and none is without meaning. 14:11 If then I do not know the meaning of a language, I will be a foreigner to the speaker and the speaker a foreigner to me. 14:12 It is the same with you. Since you are eager for manifestations of the Spirit, 2 seek to abound in order to strengthen the church.
14:13 So then, one who speaks in a tongue should pray that he may interpret. 14:14 If 3 I pray in a tongue, my spirit prays, but my mind is unproductive. 14:15 What should I do? 4 I will pray with my spirit, but I will also pray with my mind. I will sing praises with my spirit, but I will also sing praises with my mind. 14:16 Otherwise, if you are praising God with your spirit, how can someone without the gift 5 say “Amen” to your thanksgiving, since he does not know what you are saying? 14:17 For you are certainly giving thanks well, but the other person is not strengthened. 14:18 I thank God that I speak in tongues more than all of you, 14:19 but in the church I want to speak five words with my mind to instruct others, rather than ten thousand words in a tongue.