I just finished City of Glass and the ending is so perfect here that I almost wish that this is where it stopped, but no-we're only halfway through. Needless to say, there are spoilers ahead. All the photos I use can be found here:

City of Glass

"You never called me back," he said. "I called you so many times and you never called me back."
Magnus looked at Alec as if he's lost his mind. "Your city is under attack," he said. "The wards are broken, and the streets are full of demons. And you want to know why I haven't called you?"
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I love you, and I will love you until I die, and if there's a life after that, I'll love you then.
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"I know it's wrong--God it's all kinds of wrong--but I just want to lie down with you and wake up with you, just once, just once ever in my life." There was desperation in his voice. "It's just this one night. In the grand scheme of things, how much can one night matter."
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"You could have had anything else in the world, and you asked for me."
She smiled up at him. Filthy as he was, covered in blood and dirt, he was the most beautiful thing she'd ever seen. "But I don't want anything else in the world."
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"...now I'm looking at you," he said, "and you're asking me if I still want you, as if I could stop loving you. As if I would want to give up the thing that makes me stronger than anything else ever has. I never dared give much of myself to anyone before--bits of myself to the Lightwoods, to Isabelle and Alec, but it took years to do it--but Clary, since the first time I saw you, I have belonged to you completely. I still do. If you want me."
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"I am a man," he told her, "and men do not consume pink beverages. Get thee gone, woman, and bring me something brown."
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I like to throw in some funny quotes with the romantic or serious ones because they are just as iconic as the others. Freaking Herondales.

If you're into all things shadowhunters I have several collections of them because I like aesthetics and all things literary. For your sake, I'll just list the Cassandra Clare ones but check out my page for other books!