Favorite Mortal Instruments quotes:

Jace:

"I love you, and I will love you until I die, and if there is life after that, I'll love you then.”-Jace, City of Glass

"To love is to destroy and to be loved is to be the one destroyed"

“I am a man" he told her, "and men do not consume pink beverages. Get thee gone woman, and bring me something brown.”

"Of course they are," he said, "I am stunningly attractive.”

“It wouldn't be my move," Jace agreed. "First the candy and flowers, then the apology letters, then the ravenous demon hordes. In that order.”

“Did you ever think that in a past life Alec was an old woman with ninety cats who was always yelling at the neighborhood kids to get off her lawn? Because I do,”

"I hate ducks. Don't know why. I just always have.”

"so I think you were the wrong person for the Jace that I was, but not for the Jace I am now, the Jace you helped make me. who is, incidentally, a Jace I like much better than the old one. You've changed me for the better, and even if you left me, I would still have that." He paused. "Not that you should leave me," he added hastily, and leaned his head against hers, so there foreheads touched.

"And if its not, I'm going to drown him in the lake," Jace said, echoing Clare's earlier, unspoken thought.

Clary-

“So what's their plan, hitting Sebastian over the head with Jace until he passes out?”

“You know, when most girls say they want a big rock, they don't mean, you know, literally a big rock.”

"Just coffee- black. Like my soul."

“Heroes aren't always the ones who win," she said. "They're the ones who lose, sometimes. But they keep fighting, they keep coming back. They don't give up. That's what makes them heroes.”

Simon-

“I am a badass, and I recognize that you, too, are a badass.”

"Never believe the bad guy is dead until you see a body," said Simon. "That just leads to unhappiness and surprise ambushes.”

“No' is a magical word," he told her. "Here's how it goes. You say, 'Simon, I have an insane, suicidal plan. Would you like to help me carry it out?' And I say, "Why, no.”

"I always thought that was 'Good things come to those who do the wave,'" said Simon. No wonder I've been confused all my life."

Izzy-

"It's the Mortal Cup, Jace, not the Mortal Toilet Bowl," said Isabelle.”

“If you're texting Magnus to say 'I think u r kewl' I'm going to kill you”

“Honestly, Clary, if you don't start utilizing a bit of your natural feminine superiority I just don't know what I'll do with you.”

Alec-

“The only way you could raise enough money to hire Magnus by selling lemonade is if you put meth in it.”

Alec shrugged. "Look who's talking. 'oh I love her. Oh, she's my sister. Oh why, why, why—”

“All the time,” he said. “Jace could get himself killed putting his pants on in the morning. Being his parabatai is a full-time job.”

“I will not hang back here in Alicante while Magnus is in danger. Go without me, and you disrespect our parabatai oaths, you disrespect me as a shadowhunter, and you disrespect the fact that this is my battle too.”

"I did not make a pie," Alec announced when Jace and Clary returned to the large central cave... "I did not make a pie'" Alec repeated, gesturing expressively with one hand. "for three reasons. One, because I do not have any pie ingredients. two, because I don't actually know how to make a pie."

He paused, clearly waiting.

Removing his sword and laying it against the cave wall, Jace said warily, "And three?"

"because I am not your bitch," Alec said, clearly pleased who himself.

Magnus-

"I'm a very open-minded sort of fellow!”

“Because that which was new was almost always temporary. And that which was temporary broke your heart.”

Sebastian/Jonathan-

"Need I remind you," said Sebastian, "That that is my sister?"

"I have a fetish for damsels in distress."

“I've never felt so... light.”

“You’ve no idea what it’s been like, being around the lot of you these past few days, having to pretend I could stand you. That the sight of you didn’t make me sick. You,” he said to Jace, “every second you’re not panting after your own sister, you’re whining on and on about how your daddy didn’t love you. Well, who could blame him? And you, you stupid bitch”—he turned to Clary—“giving that priceless book away to a half-breed warlock; have you got a single brain cell in that tiny head of yours?”

“There was a man once who said that mothers carry the key of our souls with them all our lives. But you threw mine away”

“You have ruthlessness in your bones and ice in your heart, Clarissa. Don't tell me any differently.”

Those were some of the funny quotes I have found from the Mortal Instruments...