Jem is my greatest sin.

Ragnor and Catarina both begged him to give the instrument up. Random strangers on the street begged him to give the instrument up. Even cats ran away from him.

Will moved to object, but it was too late; Henry had already pressed the button. There was a blinding flare of light and a whooshing sound, and the room was plunged into blackness. Tessa gave a yelp of surprise, and Jem laughed softly. "Am I blind?" Will's voice floated out of the darkness, tinged with annoyance. "I'm not going to be at all pleased if you've blinded me, Henry.

Will speechless for once, a glass of water frozen halfway to his lips

And maybe you should stop pitying yourself,” he said. “Most people are lucky to have even one great love in their life. You have found two.

My mother always told me if I rode a motorcycle with a boy, she'd kill me." ... She couldn't hear him laugh, but she felt his body shake. "She wouldn't say that if she knew me," he called back to her confidently. "I'm an excellent driver." -Clary & Jace, pg.289-

For five years it had been his absolute truth. Jem and Will. Will and Jem. Will Herondale lives, therefore Jem Carstairs lives also.