Gregory the Great
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.
(in Hom. 35. in Evang.) God denounces the woes that shall forerun the destruction of the world, that so they may the less disturb when they come, as having been foreknown. For darts strike the less which are foreseen. And so He says, But when ye shall hear of wars and commotions, &c. Wars refer to the enemy, commotions to citizens. To shew us then that we shall be troubled from within and without, He asserts that the one we suffer from the enemy, the other from our own brethren.