Gregory the Great — on Ezek 2:6 (Forty Gospel Homilies, Homily 38)

“In this Church therefore neither can the evil be without the good, nor the good without the evil. Therefore, dearest brothers, bring back to mind the times past, and strengthen yourselves for the toleration of the evil. For if we are children of the elect, it necessarily remains that we walk by their examples. For he was not good who refused to tolerate the evil. For hence it is that blessed Job asserts of himself, saying: "I was a brother of dragons, and a companion of ostriches." Hence through Solomon it is said in the voice of the bridegroom to holy Church: "As a lily among thorns, so is my beloved among the daughters." Hence the Lord says to Ezekiel: "Son of man, unbelievers and subverters are with you, and you dwell among scorpions." Hence Peter glorifies the life of blessed Lot, saying: "And he rescued righteous Lot, oppressed by the injury of the wicked in their conduct; for in sight and hearing he was righteous, dwelling among those who from day to day tormented his righteous soul with their lawless deeds." Hence Paul both praises and strengthens the life of his disciples, saying: "In the midst of a crooked and perverse nation, among whom you shine as lights in the world, holding forth the word of life." Hence John testifies to the Church of Pergamos, saying: "I know where you dwell, where the throne of Satan is, and you hold my name, and you have not denied my faith." Behold, dearest brothers, running through almost all things we recognize that he was not good whom the depravity of the evil did not test. For if I may speak thus, the iron of our soul is by no means brought to the sharpness of a fine edge unless the file of another's depravity has worn it down.”