Isaiah 28:17

Discourse awhile on our present heavy blow, about the just judgments of God, whether we grasp their meaning or are ignorant of their great depth. How again "mercy is put in the balance," as holy Isaiah declares. For goodness is not without discernment, as the first laborers in the vineyard fancied, because they could not perceive any distinction between those who were paid alike. [Perceive] how anger, which is called "the cup in the hand of the Lord" and "the cup of falling which is drained," is in proportion to transgressions, even though he shows mercy to every one according to what they are due and dilutes with compassion the unmixed draught of his wrath. For he inclines from severity to indulgence toward those who accept chastisement with fear, and who after a slight affliction conceive and are in pain with conversion, and bring forth the perfect spirit of salvation. But nevertheless he reserves the dregs, the last drop of his anger, that he may pour it out entire upon those who, instead of being healed by his kindness, grow obdurate, like the hard-hearted Pharaoh, that bitter taskmaster, who is set forth as an example of the power of God over the ungodly.

The Judge wishes to have mercy on you and to share his own compassion, but on condition that he finds you humble after sin, contrite, lamenting much for your evil deeds, announcing publicly without shame sins committed secretly, begging the brothers to labor with you in reparation. In short, if he sees that you are worthy of pity, he provides his mercy for you ungrudgingly. But if he sees your heart unrepentant, your mind proud, your disbelief of the future life and your fearlessness of the judgment, then he desires the judgment for you. [This is like] a reasonable and kind doctor [who] tries at first with hot applications and soft poultices to reduce a tumor. But, when he sees that the mass is rigidly and obstinately resisting, casting away the olive oil and the gentle method of treatment, he prefers henceforth the use of the knife. Therefore [God] loves mercy in the case of those repenting, but he also loves judgment in the case of the unyielding. Isaiah says some such thing, too, to God: "Your mercy in measure." For he compares the mercy with the judgment of him who gives compensation by scale and number and weight according to the deserts of each.

(Verses 17-18). And I will put judgment in the balance, and justice in the measure: and hail will overthrow the hope of lies, and the covering waters will flood. And your covenant with death shall be abolished, and your pact with Hell shall not stand; when the overflowing scourge passes through, you shall be trampled. LXX: And I will set judgment as hope; but my mercy as a burden, and those who believe in vain falsehood, for the storm will not pass through us, and it will not take away from us the testament of death, and your hope will not remain in hell. If the coming storm passes, you will be trampled by it. And God also promises to put judgment in Him: For the Father does not judge anyone, but he has given all judgment to the Son (John V, 22). And justice or mercy in measure, in order to render to each according to his works, and to temper justice and mercy with each other, according to what we also read in the Psalms: Mercy and truth have met each other: justice and peace have kissed (Ps. LXXXIV, 11). He also says that your hope and falsehood, that is, the devil, the father of all falsehood, will overthrow the hailstorm of my punishments. And the protection, under which you thought you would be safe, a powerful storm and a multitude of waters will destroy, so that the friendship and treaty that you had with death and with Hell, that is, with the devil, may perish eternally. And the whip or storm, of which you said: 'When the overwhelming whip passes, it will not come upon us' - it will come, and you will be trodden down by it, that is, you will suffer all the torments that you believed you would never endure in despair.