He had lost Will Herondale. And he did not know if he could ever get him back.

Do reasons matter when there's nothing that can be done to change things.

Sometimes, when I have to do something I don't want to do, I pretend I'm a character from a book. It's easier to know what they would do.

Do you think Charlotte will let me handle the investigation?"
"Do you think you can be trusted in Downworld? The gaming hells, the dens of magical vice, the women of loose morals..."
Will smiled the way Lucifer might have smiled, moments before he fell from heaven. "Would tomorrow be to early to start looking, do you think?
Jem sighed. 'Do what you like, William. You always do.

Will: "Nice place to live, isn't it? Let's hope they left something behind other than filth. Forwarding addresses, a few severed limbs, a prostitute or two ..."
Jem: "Indeed. Perhaps, if we're fortunate, we can still catch syphilis."
"Or demon pox," Will suggested cheerfully, trying the door under the stairs.

When Will says 'enterprising', he means 'morally deficient.'"
"No, I mean enterprising," said Will. "When I mean morally deficient, I say, 'Now, that's something I would have done.