Caesarius of Arles — on Rev 9:5 (EXPOSITION ON THE APOCALYPSE 9:4, HOMILY 7)

“There are two parts in the church, one part of those who are good and one part of those who are evil. The one part is persecuted in order that it might be corrected; the other part is given up to its own desires. A part of those who are good is handed over to humiliation that they might know the righteousness of God and might remember penance, as it is written, "It is good that you have humbled me, that I might know your righteous deeds." [The torture like a sting of a scorpion] occurs when the devil draws near through the poison of transgressions and sins.”