Bede the Venerable
Catena Aurea · Lukasevangelium 21
But when ye shall hear of wars and commotions, be not terrified: for these things must first come to pass; but the end is not by and by. Then said he unto them, Nation shall rise against nation, and kingdom against kingdom: And great earthquakes shall be in divers places, and famines, and pestilences; and fearful sights and great signs shall there be from heaven.
The Apostles are also exhorted not to be alarmed by these forerunners, nor to desert Jerusalem and Judæa. But the kingdom against kingdom, and the pestilence of those whose word creepeth as a cancer, and the famine of hearing the word of God, and the shaking of the whole earth, and the separation from the true faith, may be explained also in the heretics, who contending one with another bring victory to the Church.