Still more does the human throat do so, expressing an infinite multitude of concepts in articulate sounds and words. How, then, should an organ of the Spirit of God, possessing the gift of tongues, not care to be able to explain what it utters, for the fuller benefit of the Church?
Blessed Theophylact, pausing over the Apostle’s words, “unless I speak either by revelation, or by understanding, or by prophecy, or by teaching,” explains these apostolic indications of the different kinds of preaching in the primitive Church as follows.
“By revelation, that is, what those who receive revelations from God usually say. This includes the case when, in the presence of all, the thoughts of each are revealed.
By understanding, that is, what those who possess knowledge can say when they set forth the mysteries of God to their hearers. By prophecy, that is, declaring what was, what is, and what will be. Prophecy comprehends revelations.
By teaching, that is, in the form of an instructive word, when the discourse concerns virtue and doctrines.”