“I want to hire someone to stand outside my door and knock three times, with each knock being three years apart. At the end of the nine years I’ll reply, “Who is it?” And without delay or reply, the person on the other side of the door is to find a new job.”

“What is the knocking?What is the knocking at the door in the night?It is somebody who wants to do us harm.No, no, it is the three strange angels. Admit them, admit them.”

“I start walking toward my bike with renewed purpose."I don't think I need any help to knock on a door."Carlos yells, "Be careful, my friend. The problem with knocking on doors is you're never quite sure who's going to be on the other side.”

“There came one and knocked at the door of the Beloved.And a voice answered and said, 'Who is there?'The lover replied, 'It is I.''Go hence,' returned the voice;'there is no room within for thee and me.'Then came the lover a second time and knocked and again the voice demanded,'Who is there?'He answered, 'It is thou.''Enter,' said the voice, 'for I am within.”

“I fear one day I’ll get a knock at my front door, and I’ll answer it to find myself standing there. Then I’ll hear myself say, “Hi, I’m from the future, and I’m here to destroy you.” But that is irrational. The future me isn’t out to destroy me, because the me of my past already did a thorough job demolishing my present and possible future.”

“The good life doesn't knock on the door. Joy is a job.”