Matthew Poole and continuators on 1 Peter 5:9

9 Whom resist stedfast in the faith , knowing that the same afflictions are accomplished in your brethren which are in the world .

By not yielding to his Temptations, Eph. 4.27. and by employing your Spiritual Armour against him, Eph. 6.11, 12, 13, &c. See Iam. 4.7.

Either, 1. Hold your Faith, persevering in it, which the Devil would fain bereave you of, (as Soldiers used in War to look to their Shields, it being dishonourable to lose them) and without which ye will never be able to stand out against the Devil; or, 2. Stedfast or strong by Faith; intimating, that Faith is a Christians greatest strength, it being by Faith that he engageth the Power of God, and Grace of Christ on his side, whereby he comes to be Victorious over all his Enemies, 1 Ioh. 5.4.

Either, 1. The Devil's Temptations, which here he calls Afflictions, because Believers are Passive in them, and count them the greatest Afflictions; or, rather, 2. Persecution, which though they come upon them immediately from the Men of the World, yet it is by the instigation of the Devil, the Prince of the World, who hath a principal hand in them, and acts by Men as his Instruments: so that when Men oppress them, they are to resist the Devil, who thereby tempts them. They have a Spiritual Enemy to deal with even in Temporal Afflictions.

Or, fulfilled, or perfected, Either, 1. Others of your Brethren are filling up the measure of Sufferings God hath alotted them, for the mortifying of the Flesh, and conforming them to Christ their head, as well as you are filling up yours, Col. 1.24. Or, 2. He speaks of the community of their Sufferings, q. d. what Afflictions ye endure, others endure too, and therefore ye should not grudg to suffer, when ye have so good Company in your Sufferings.

Either this notes the Sufferings of the Saints to be Universal, so as to reach them all, wheresoever they are dispersed throughout the World; or, to be short, as being confined to the time only of their abode in the World.