"For the good that I would I do not: but the evil which I would not, that I do"

"I do not deal in Absolute Evil... I do not think that at any rate any ‘rational being’ is wholly evil." The line between good and evil "is not just external, between the white chess pieces and the black, but within every single piece on the board." 

(J.R.R. Tolkien as quoted in the Afterward of Proverbs of Middle-earth)

“If only it were all so simple! If only there were evil people somewhere insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?”

(Aleksandr Solzhenitsyn in The Gulag Archipelago)