Love and lies can corrupt even the purest heart.

... everything seemed to him a uniform shade of gray- even the people! He had been unable to believe it could rain so much in one place, and so unceasingly. The damp had seemed to come up from the floors and into his bones, so that he'd thought he would eventually sprout mold, in the manner of a tree. "You do get used to it," he said "Even if sometimes you feel as if you out to be able to be wrung out like a washrag." p 311

And maybe I am a monster. I don't know the answer to that. But what I do know is that even if there's demon blood inside me, there is human blood inside me as well. And I couldn't love you like I do if I weren't at least a little bit human. Because demons want. But they don't love.

Will spread his arms wide. On his knees, grinning like a demon, blood dripping from his mouth, he barely looked human himself. “Come and get me.

The moment the door closed behind him, Tessa was in Will's arms, her hands locked about his neck. "Oh, by the Angel," she said. "That was mortifying." Will slid his hands into her hair and was kissing her, kissing her eyelids and her cheeks and then her mouth, quickly but with fervor and concentration, as if nothing could be more important. "Listen to you," he said. "You said 'by the angel.' Like a Shadowhunter." He kissed the side of her mouth. "I love you. God, I love you. I waited so long to say it.

What are you doing following me around the back streets of London, you little idiot?” Will demanded, giving her arm a light shake. Cecily’s eyes narrowed. “This morning it was cariad (note: Welsh endearment, like ‘darling’ or ‘love’), now it’s idiot.

You are the central point about which his world spins.