25 We both believe in and hear of the dregs of the anger of God, the residuum of His dealings with those who deserve it: For the Lord is a God of vengeance. For although He is disposed by His kindness to gentleness rather than severity, yet He does not absolutely pardon sinners, lest they should be made worse by His goodness. Yet my father kept no grudge against those who provoked him, indeed he was absolutely uninfluenced by anger, although in spiritual things exceedingly overcome by zeal: except when he had been prepared and armed and set in hostile array against that which was advancing to injure him.
So that this sweet disposition of his would not, as the saying goes, have been stirred by tens of thousands. For the wrath which he had was not like that of the serpent, smouldering within, ready to defend itself, eager to burst forth, and longing to strike back at once on being disturbed; but like the sting of the bee, which does not bring death with its stroke; while his kindness was superhuman. The wheel and scourge were often threatened, and those who could apply them stood near; and the danger ended in being pinched on the ear, patted on the face, or buffeted on the temple: thus he mitigated the threat.
His dress and sandals were dragged off, and the scoundrel was felled to the ground: then his anger was directed not against his assailant, but against his eager succourer, as a minister of evil. How could anyone be more conclusively proved to be good, and worthy to offer the gifts to God? For often, instead of being himself roused, he made excuses for the man who assailed him, blushing for his faults as if they had been his own.
Source: Orations (New Advent)