7 Even things without life that give sound, whether pipe or harp, except they give a distinction of sounds, how shall it be known what is piped or harped?
8 For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
9 So likewise you, except you utter by the tongue plain speech, how shall it be known what is said? For you shall be speaking into the air.
10 There are, for example, so many kinds of tongues in this world; and none is without voice.
11 If then I know not the power of the voice, I shall be to him to whom I speak a barbarian; and he that speaketh, a barbarian to me.
12 So you also, forasmuch as you are zealous of spirits, seek to abound unto the edifying of the church.
13 And therefore he that speaketh by a tongue, let him pray that he may interpret.