“Sir Isaac Newton, renowned inventor of the milled-edge coin and the catflap!""The what?" said Richard."The catflap! A device of the utmost cunning, perspicuity and invention. It is a door within a door, you see, a ...""Yes," said Richard, "there was also the small matter of gravity.""Gravity," said Dirk with a slightly dismissed shrug, "yes, there was that as well, I suppose. Though that, of course, was merely a discovery. It was there to be discovered." ... "You see?" he said dropping his cigarette butt, "They even keep it on at weekends. Someone was bound to notice sooner or later. But the catflap ... ah, there is a very different matter. Invention, pure creative invention. It is a door within a door, you see.”

“Little Richard was drenched in milk, and the cow was none too happy. But the iron brig door hung open. "Good job," said Slank. "Next time, you milk the cow," said Little Richard.”

“The law of gravity and gravity itself did not exist before Isaac Newton." ...and what that means is that that law of gravity exists nowhere except in people's heads! It 's a ghost!"Mind has no matter or energy but they can't escape its predominance over everything they do. Logic exists in the mind. numbers exist only in the mind. I don't get upset when scientists say that ghosts exist in the mind. it's that only that gets me. science is only in your mind too, it's just that that doesn't make it bad. or ghosts either."Laws of nature are human inventions, like ghosts. Law of logic, of mathematics are also human inventions, like ghosts."...we see what we see because these ghosts show it to us, ghosts of Moses and Christ and the Buddha, and Plato, and Descartes, and Rousseau and Jefferson and Lincoln, on and on and on. Isaac Newton is a very good ghost. One of the best. Your common sense is nothing more than the voices of thousands and thousands of these ghosts from the past.”

“Sir Isaac Newton was asked how he discovered the law of gravity. He replied, "By thinking about it all the time.”

“But had I not cut the cord? and now was I seeing what happens when there is no gravity. There is indeed nothing, nothing; you are just falling. My father had said once (or was it you?) that the only emotions worth having are ecstasy and despair. I thought - Well yes, but there is also a terror at this nothing.”

“Everyone knows that quote because of the Doors." Jace looked at her blankly."The Doors. They were a band.""If you say so," he said."I suppose you don't have much time for enjoying music," Clary said, thinking of Simon, for whom music was his entire life, "in your line of work."He shrugged. "Maybe the occasional wailing chorus of the damned.”