10. There are, it may be, so many kinds of voices in the world, and none of them is unmeaning,
11. if, then, I do not know the power of the voice, I shall be to him who is speaking a foreigner, and he who is speaking, is to me a foreigner;
12. so also ye, since ye are earnestly desirous of spiritual gifts, for the building up of the assembly seek that ye may abound;
13. wherefore he who is speaking in an [unknown] tongue--let him pray that he may interpret;
14. for if I pray in an [unknown] tongue, my spirit doth pray, and my understanding is unfruitful.
15. What then is it? I will pray with the spirit, and I will pray also with the understanding; I will sing psalms with the spirit, and I will sing psalms also with the understanding;
16. since, if thou mayest bless with the spirit, he who is filling the place of the unlearned, how shall he say the Amen at thy giving of thanks, since what thou dost say he hath not known?
17. for thou, indeed, dost give thanks well, but the other is not built up!
18. I give thanks to my God--more than you all with tongues speaking--
19. but in an assembly I wish to speak five words through my understanding, that others also I may instruct, rather than myriads of words in an [unknown] tongue.
20. Brethren, become not children in the understanding, but in the evil be ye babes, and in the understanding become ye perfect;
21. in the law it hath been written, that, `With other tongues and with other lips I will speak to this people, and not even so will they hear Me, saith the Lord;'