7 What are You doing, O Idithun, Body of Christ, leaping over them? What are You doing amid all these things? What will You do? Will you faint? Will You not persevere even unto the end? Will You not hearken, “He that shall have persevered even unto the end, the same shall be saved,” though for that iniquity abounds, the love of many shall wax cold? And where is it that You have leaped over them? Where is it that Your conversation is in Heaven? But they cleave unto earthly things, as though earthborn they mind the earth, and are earth, the serpent's food. What do you amid these things?...“Nevertheless, to God my soul shall be made subject”.
And who would endure so great things, either open wars, or secret lyings-in-wait? Who would endure so great things amid open enemies, amid false brethren? Who would endure so great things? Would a man? And if a man would, would a man of himself? I have not so leaped over that I should be lifted up, and fall: “To God my soul shall be made subject: for from Himself is my patience.” What patience is there amid so great scandals, except that “if for that which we do not see we hope, through patience we look for it”? There comes my pain, there will come my rest also; there comes my tribulation, there will come my cleansing also.
For does gold glitter in the furnace of the refiner? In a necklace it will glitter, in an ornament it will glitter: let it suffer however the furnace, in order that being cleansed from dross it may come into light. This is the furnace, there is there chaff, there gold, there fire, into this blows the refiner: in the furnace burns the chaff, and the gold is cleansed; the one into ashes is turned, of dross the other is cleansed. The furnace is the world, the chaff unrighteous men, the gold just men; the fire tribulation, the refiner God: that which therefore the refiner wills I do; wherever the Maker sets me I endure it.
I am commanded to endure, He knows how to cleanse. Though there burn the chaff to set me on fire, and as if to consume me; that into ashes is burned, I of dross am cleansed. Wherefore? Because “to God my soul shall be made subject: for from Himself is my patience.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)