Cyrill of Alexandria
It will come to pass that the Lord will manifest His presence among them, and His arrows will strike like lightning. In these words, He signifies that the Lord God will accompany them in battle, confronting and defeating their enemies. The Lord will be with them, especially those who have attempted to oppose the messengers of His gospel; for every arrow serves as a teacher or a witness. He further compares them to the arrows or spears sent forth by God. Like lightning, He states, they will run forth, evidently shining brightly and capturing the attention of all. The divine servants and proclaimers of the Savior's gospel, along with the leaders of the people and heads of the churches who followed them, possessed such radiant virtue that it could not be hidden from anyone.
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To illustrate this, the Savior also said: “No one lights a lamp and puts it under a basket, but on a lampstand, that those who enter may see the light” (Matt. 5:15; cf. Luke 4:21), and again, “Let your light so shine before men, that they may see your good works and glorify your Father in heaven” (Matt. 5:16). The Lord Almighty will sound the trumpet and go forth amidst the sound of His praise. This statement clearly portrays God as the companion and ally of all humanity, prepared and eager to engage in battle, as if He were ready for war and already exerting His power against His foes and their inherent strength. It is rightly stated that He fights not against those who are engaged in justification by faith, but against those who have stubbornly opposed the divine message, as Paul indicated when he remarked, “A great and effective door has been opened to me, and there are many adversaries” (1 Cor. 16:9). The Lord will sound the trumpet, He asserts (1 Cor. 9:9). It is evident that the Lord speaks of the preaching of the gospel, which has resonated throughout the world, making the mystery of Christ known to all. Moses was a man of great stature and slow of speech; thus, his voice barely reached Judaea. However, the proclamation of Christ knows no boundaries, for it resounded like a powerful and far-reaching trumpet, reaching the ears of all.