Cross reference
1 Corinthians 14:17
17 for thou, indeed, dost give thanks well, but the other is not built up!
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;
1 Corinthians 14:6
6 And now, brethren, if I may come unto you speaking tongues, what shall I profit you, except I shall speak to you either in revelation, or in knowledge, or in prophesying, or in teaching?