¹³ Therefore, one who speaks in a tongue should pray that he may interpret. ¹⁴ For if I pray in a tongue, my spirit prays but my mind is unfruitful. ¹⁵ What am I to do? I will pray with my spirit, but I will pray with my mind also; ^(A)I will sing praise with my spirit, but I will ^(B)sing with my mind also. ¹⁶ Otherwise, if you give thanks with your spirit, how can anyone in the position of an outsider^[a] say ^(C)“Amen” to ^(D)your thanksgiving when he does not know what you are saying? ¹⁷ For you may be giving thanks well enough, but the other person is not being built up. ¹⁸ I thank God that I speak in tongues more than all of you. ¹⁹ Nevertheless, in church I would rather speak five words with my mind in order to instruct others, than ten thousand words in a tongue.

²⁰ Brothers, ^(E)do not be children in your thinking. ^(F)Be infants in evil, but in your thinking be ^(G)mature. ^21 (H)In the Law it is written, ^(I)“By people of strange tongues and by the lips of foreigners will I speak to this people, and even then they will not listen to me, says the Lord.” ²² Thus tongues are a sign not for believers but for unbelievers, while prophecy is a sign^[b] not for unbelievers but for believers. ²³ If, therefore, the whole church comes together and all speak in tongues, and outsiders or unbelievers enter, ^(J)will they not say that you are out of your minds? ²⁴ But if all prophesy, and an unbeliever or outsider enters, he is convicted by all, he is called to account by all, ^25 (K)the secrets of his heart are disclosed, and so, ^(L)falling on his face, he will worship God and ^(M)declare that God is really among you.