Commentaries
14:6-14 Even an apostle could not edify, unless he spoke so as to be understood by his hearers. To speak words that have no meaning to those who hear them, is but speaking into the air. That cannot answer the end of speaking, which has no meaning; in this case, speaker and hearers are barbarians to each other. All religious services should be so performed in Christian assemblies, that all may join in, and profit by them. Language plain and easy to be understood, is the most proper for public worship, and other religious exercises. Every true follower of Christ will rather desire to do good to others, than to get a name for learning or fine speaking.
6. Translate, "But now"; seeing there is no edification without interpretation.
revelation … prophesying—corresponding one to the other; "revelation" being the supernatural unveiling of divine truths to man, "prophesying" the enunciation to men of such revelations. So "knowledge" corresponds to "doctrine," which is the gift of teaching to others our knowledge. As the former pair refers to specially revealed mysteries, so the latter pair refers to the general obvious truths of salvation, brought from the common storehouse of believers.