Simon pushed [her messenger bag strap] back up absently, his finger lingering at the bare skin of her shoulder. (2.139)
Clary sure doesn't recognize this lingering touch, and we're not sure if Simon's doing it consciously either, at this point. We're talking ten years of unrequited love here.
[Simon's] face was so familiar [Clary] could have traced its lines in her sleep. (2.161)
This is sweet, but it's more like brother/sister love than the romantic love Simon desires. If only he was her real brother, like Jace, (spoiler alert!) then maybe she would have romantic feelings toward him…
"Declarations of love amuse me, especially when unrequited." (3.57)
Jace's amusement at unrequited love is ironic because he has his own unrequited love for Clary, his sister. He'll get down off his cynical high horse soon enough.
"[Parabatai] means a pair of warriors who fight together—who are closer than brothers. Alec is more than just my best friend." (6.52)
Alec is to Jace what Simon is to Clary. The object of their affection loves them, but only in a familial way.
"The most terrible things men do, they do in the name of love." (7.84)
Maybe that's why The Supremes command men to stop in the name of love. But in all seriousness, this moment tells us that besides revenge, there's one other clear motivator in this book: ooey gooey, hearts and flowers, rainbows and unicorns love.
[Jace's] hands were cool on [Clary's], and she was aware of them in a way she had not been of Simon's. (10.121)
Jace's hands may be cool, but their relationship is heating up fast.
"Falcons are not meant to be loving pets: They are fierce and wild, savage and cruel. This bird was not tamed; it was broken." (11.160)
This story told by Jace says a lot about why he puts up a prickly façade to keep people away. He's both scared of loving and being loved. Vampires on the other hand? Not scary at all.
"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.
"There might have been a time when one or the other of us considered it, but [Isabelle's] almost a sister to me. It would be strange." (17.69)
Almost a sister = strange. Actually a sister = go for it, bro! This book has some strange notions about incest. But we have a sneaking suspicion that those notions might be explained in the sequels…
"Where there is love, there is often also hate. They can exist side by side." (18.128)
There's a fine line between these two seemingly opposite emotions, both rooted in passion, which explains why you can get so incredibly mad at someone you love.
"I loved [Valentine] too: He was my closest friend, and I was happy to see Jocelyn with him." (21.10)
Luke talks about his love for Valentine in past tense, so we're pretty sure he won't re-join Valentine's cause the way Hodge does.