Satan has admitted to me that I am the object of his hatred. He said that "a thousand souls do me less harm than you do when you speak of the great mercy of the Almighty One. The greatest sinners regain confidence and return to God , and I lose everything. But what is more, you persecute me personally with that unfathomable mercy of the Almighty One." I took note of the great hatred Satan has for the mercy of God. He does not want to acknowledge that God is good. (1167)
As I write these words, I hear the cry of Satan: "She's writing everything, she's writing everything, and because of this we are losing so much! Do not write about the goodness of God; He is just!" And howling with fury, he vanished. (1338)
--St. Faustina Kowalska
