"God never shuts one door without opening another."

"The door was the way to... to... The Door was The Way. Good. Capital letters were always the best way of dealing with…"

"Sir Isaac Newton, renowned inventor of the milled-edge coin and the catflap!" "The what?" said Richard. "The catflap!…"

"It's a door, Sol. It's a door."

"There are a great many doors open; but a door must be of a man's size or it is not meant for him."

"If the doors of perception were cleansed everything would appear to man as it is, infinite."

"Well, if I eat it, and if it makes me grow larger, I can reach the key; and if makes me grow smaller, I can creep und…"

"there's a hell of a good universe next door; let's go"

"When God sends his angel to the soul it becomes the one who knows for sure. Not for nothing did God give the keys int…"

"Last thing I remember, I was running for the door. I had to find the passage back, to the place I was before."