"Value your parabatai," he said. "For it is a precious bond. All love is precious. It is why we do what we do. Why do we fight demons? Why are they not fit custodians of this world? What makes us better? It is because they do not build, but destroy. They do not love, but hate only. We are human and fallible, we Shadowhunters. But if we did not have the capability to love, we could not guard humans; we must love to guard them. My parabatai, he loved like few ever could love, with all and everything. I see you are like that too; it burns more brightly in you than the fire of Heaven"

“I figured all your classes were stuff like Slaughter 101 and Beheading for Beginners.”

“It's the Mortal Cup, Jace, not the Mortal Toilet Bowl.”

“Hearing my achievements recited is certainly gratifying, but I'm not sure what your point is, Alec.”

“Here, I'll practice on you. Mom. I have something to tell you. I'm undead. Now, I know you may have some preconceived notions about the undead. I know you may not be comfortable with the idea of me being undead. But I'm here to tell you that the undead are just like you and me. Well, okay. Possibly more like me than you.”

“Sometimes it comes down to a choice. Between saving one person and saving the whole world. I've seen it happen, and I'm selfish enough to want the person who loves me to choose me. But Nephilim will always choose the world. I look at Alec and I feel like Lucifer in Paradise Lost. "Abashed the Devil stood, And felt how awful goodness is." He meant it in the classic sense. 'Awful' as in inspiring awe. And awe is well and good, but it's poison to love. Love has to be between equals.”

“With Jace, you don't really get to choose your insulting nickname.”