Catena Aurea on Matthew 24:6–8: Origen

Or otherwise; As the body sickens before the death of the man, so it must needs be that before the consummation of this world the earth should be shaken, as though it were palsied, with frequent earthquakes, the air should gather a deadly quality and become pestilential, and that the vital energy of the soil should fail, and its fruits wither. And by consequence of this scarcity, men are stirred up to robbery and war. But because war and strife arise sometimes from covetousness, and sometimes from desire of power and empty glory, of these which shall happen before the end of the world a yet deeper cause shall be assignable.

For as Christ’s coming brought through His divine power peace to divers nations, so it shall be on the other hand, “that when iniquity shall abound, the love of many shall wax cold,” and God and His Christ shall desert them; wars shall be again when actions which beget wars are not hindered by holiness; and hostile powers when they are not restrained by the Saints and by Christ shall work unchecked in the hearts of men, stirring up nation against nation, and kingdom against kingdom.

But if, as some will have it, famine and pestilence are from the Angels of Satan, these shall then gather might from opposite powers, when the salt of the earth, and the lights of the world, Christ’s disciples, shall be no longer, destroying those things which the malice of daemons hatches. Ofttimes in Israel famines and pestilences were caused by sin, and removed by the prayers of the Saints. [marg. note: 1 Ki 17:1, Jer 14, James 5:17-18]

Well is that said, “In divers places,” for God will not destroy the whole race of men at once, but judging them in portions, He gives opportunity of repentance. But if some stop be not put to these evils in their commencement, they will progress to worse, as it follows, “These all are the beginnings of sorrows,” that is, sorrows common to the whole world, and those which are to come upon the wicked who shall be tormented in most sharp pains.