Cross reference
1 Corinthians 14:19
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.
1 Corinthians 14:21-22
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;'
22 so that the tongues are for a sign, not to the believing, but to the unbelieving; and the prophesy `is' not for the unbelieving, but for the believing,
1 Corinthians 14:4
4 he who is speaking in an `unknown' tongue, himself doth edify, and he who is prophesying, an assembly doth edify;