“Two U. S. Marine skeletons guarded the doors. They grinned down at us, rocket-propelled grenade launchers held across their chests.
"You know," Grover mumbled, "I bet Hades doesn't have trouble with door-to-door salesman.”

“I am not suited to the role of going around selling the life-can-be-beautiful idea. It can be, indeed. But you don't buy the concept from your friendly door-to-door lecture salesman.”

“With a sigh of relief, Clary glanced back over her shoulder. Magnus was standing at the door to the cottage, his arms folded across his chest. Catching her eye, he grinned and dropped one eyelid in a single, glittering wink.”

“Through soundless labyrinths of dream you pass,
Through many doors to the one door of all.
Soon as it's opened we shall hear a music:
Or see a skeleton fall...”

“Sure," said Adrian. "I bet going in there and kicking down the door will change their minds. Take Rose with you, and you guys'll make a really good impression.”

“Elizabeth's voice had a door in it. When you opened that door you found another door, and that door opened yet another door. All the doors were nice and led out of her.”

“Intellect takes you to the door, but it doesn't take you into the house.”

“Two things that matter to me. Emotional resonance and rocket launchers.”

“Toughest job I ever had: selling doors, door to door.”

“When you follow your bliss… doors will open where you would not have thought there would be doors, and where there wouldn't be a door for anyone else.”