Clary Fairchild: I was in bed most of the day. What about you? Aren’t you exhausted?

Jace Herondale: Much like the postal service, demon hunters never sleep. “Neither snow nor rain nor heat nor gloom of night stays these…”

Clary Fairchild: You’d be in major trouble if gloom of night did stay you.

From the book The Mortal Instruments: City of Bones (Book One) | Written by Cassandra Clare