“Love isn't a weakness.”

“I always thought love made you stupid. Made you weak. A bad Shadowhunter. 'To love is to destroy.'I believed that[...]I used to think being a good warrior meant not caring,[...] And then I met you. You were a mundane. Weak. Not a fighter. Never trained[...] Love didn't make you weak, it made you stronger than anyone I'd ever met. And I realized I was the one who was weak.”

“Blood isn't love”

“Love didn't make you weak, it made you stronger.”

“But they love each other. Isn't that what love means? That you're supposed to be there for the other person to turn to, no matter what?”

“But they love each other," Clary said, appalled. "Isn't that what love means? That you're supposed to be there for the other person to turn to, no matter what?"Luke looked toward the river, at the dark water moving slowly under the light of the autumn moon. "Sometimes, Clary," he said, "love just isn't enough.”

“The Sisters vanished entirely then, and Aunt Harriet was standing over Tessa, her face flushed with fever as it had been during the terrible illness that had killed her. She looked at Tessa with great sadness. "I tried," she said. "I tried to love you. But it isn't easy to love a child that isn't human in the least....""Not human?" said an unfamiliar female voice. "Well, if she isn't human, Enoch, what is she?" The voice sharpened in impatience. "What do you mean, you don't know? Everyone's something. This girl can't be nothing at all....”