THEOSISCyrill of Alexandria
The holy prophets often shrouded their messages in a degree of obscurity, aware that the people of Israel had a tendency toward anger. Consequently, they chose a balanced approach to convey their ideas, resulting in explanations that were frequently unclear. When it is stated, "At that time they shall sound," it appears to refer to these same sacred guardians of mystery. Their call shall be profound, akin to the sound of a great trumpet, as if they intend to deliver a gospel message to those on earth, heralding something magnificent and extraordinary. Indeed, their proclamation will resonate throughout all the earth, achieving resonance to the ends of the world (Psalm 18:5).
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The trumpet was previously utilized by the esteemed Moses, though it was not very powerful; he had a weak voice, and the influence of the law he preached extended only to one nation, the Jews. In contrast, the divine and redemptive message reverberates through every city and region, striking like a thunderbolt across the heavens.
Similar thoughts are expressed in the writings of Moses: "The God of all men came down in the form of fire on Mount Sinai" (Exodus 19:10). It was accompanied by smoke and hail, and the atmosphere was filled with thick darkness, yet a great sound of a trumpet was also heard, with a strong proclamation (Ex. 19:19). Initially, the law was communicated in a quiet manner, but in due course, a mighty trumpet sound emerged. Thus, he asserts that at that time, the proclamation—the gospel—will be made with a great trumpet, gathering those who have strayed and freeing those trapped in the error of idolatry. Those lost in Assyria and Egypt will return, worshiping the Lord upon the holy mountain in Jerusalem. He mentions these two nations, Assyria and Egypt, as particularly steeped in superstition compared to others. Yet, those who had perished in them will be called to faith and come to the knowledge of the true Lord and God, worshiping Him not in defiled places but upon the holy mountain, which signifies the church. He refers to it as a mountain because the churches are characterized by elevated and sublime doctrines, and he calls it Jerusalem as it represents the ultimate spiritual vision of the world.