I told him I was going to betray you, and betray Lyra, and he believed me because I was corrupt and full of wickedness; he looked so deep I felt sure he’d see the truth. But I lied too well. I was lying with every nerve and fiber and everything I’d ever done…I wanted him to find no good in me, and he didn’t. There is none.
Philip Pullman, The Amber Spyglass