So as not to grieve any of those who were abusing the gift of tongues, the Apostle says it would not be good if, for example, he himself came and began speaking among them in an unintelligible language. They knew well, of course, that this could not and did not happen.
Then, persuading them not to abuse the gift of tongues, the Apostle shows that even inanimate things used to express human thoughts and feelings give intelligible sounds. Such are the pipe, the harp, and the trumpet.
How much more does the human throat express an infinite multitude of concepts in articulate sounds and words. How, then, can an organ of the Spirit of God, possessing the gift of tongues, fail to care about the ability to explain what is uttered by them, for the fuller benefit of the Church?
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Blessed Theophylact pauses over the Apostle's words: "if I do not speak either by revelation, or by knowledge, or by prophecy, or by teaching." He explains these apostolic indications of the various kinds of preaching found in the primitive Church in this way.
"By revelation" means what those who receive revelations from God are accustomed to say. This also includes the case when the thoughts of each person are revealed in the presence of all.
"By knowledge" means what those can say who possess knowledge and set forth the mysteries of God to their hearers.
"By prophecy" means telling what was, what is, and what will be. Prophecy embraces revelations.
"By teaching" means in the form of an instructive word, when the discourse concerns virtue and dogmas.