1 Corinthians 14:7-12

7Even in the case of lifeless instruments, such as the flute or harp, how will anyone recognize the tune they are playing unless the notes are distinct? 8Again, if the trumpet sounds a muffled call, who will prepare for battle? 9So 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.

10Assuredly, there are many different languages in the world, yet none of them is without meaning. 11If, then, I do not know the meaning of someone’s language, I am a foreigner1 to the speaker, and he is a foreigner to me.

12It is the same with you. Since you are eager to have spiritual gifts, strive to excel in gifts that build up the church.