Quote 1
Clary said, "I'm not blind, you know." "Oh, but you are," said Jace. (1.80)
Jace has knowledge and vision that Clary doesn't, so he can serve as her guide into the Underworld, à la Virgil in Dante's Inferno. Basically, the hottie's here to show her a whole new world.
Quote 2
"If we catch Valentine," [Clary] asked abruptly, "can we kill him?" (22.60)
Speaking of grinding axes, it seems that Clary has begun sharpening her own. Seriously, why are all these folks so hot-blooded? Or hotheaded?
Quote 3
"I've only ever loved three people in my life," [Clary] said. "My mom and Luke, and you." (16.66)
We're glad Clary didn't include Jace on this list. She's only known him for a few days at this point, so at least we know she's kept her head. Simon's been around for years.