Quotes from The Principia: Mathematical Principles of Natural Philosophy

“This most beautiful system [The Universe] could only proceed from the dominion of an intelligent and powerful Being.”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

“Kepler's laws, although not rigidly true, are sufficiently near to the truth to have led to the discovery of the law of attraction of the bodies of the solar system. The deviation from complete accuracy is due to the facts, that the planets are not of inappreciable mass, that, in consequence, they disturb each other's orbits about the Sun, and, by their action on the Sun itself, cause the periodic time of each to be shorter than if the Sun were a fixed body, in the subduplicate ratio of the mass of the Sun to the sum of the masses of the Sun and Planet; these errors are appreciable although very small, since the mass of the largest of the planets, Jupiter, is less than 1/1000th of the Sun's mass.”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

“Resistance is usually ascribed to bodies at rest, and impulse to those in motion; but motion and rest, as commonly conceived, are only relatively distinguished; nor are those bodies always truly at rest, which commonly are taken to be so.”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

“This most beautiful system of the sun, planets, and comets, could only proceed from the counsel and dominion of an intelligent and powerful Being. And if the fixed stars are the centers of other like systems, these, being formed by the like wise counsel, must be all subject to the dominion of One.”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

“the one as much as it advances that of the other. If a body impinge upon another, and by its force change the motion of the other, that body also (because of the equality of the mutual pressure) will undergo an equal change, in its own motion, towards the contrary part.”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

“Hypotheses non fingo (Latin for "I feign no hypotheses", "I frame no hypotheses", or "I contrive no hypotheses")”
― Isaac Newton, quote from The Principia: Mathematical Principles of Natural Philosophy

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Popular quotes

“Maybe they hurt so much that the only way they can say it, is to say nothing”
― Matthew Dicks, quote from Memoirs of an Imaginary Friend

“So how do people with autism see the world, exactly? We, only we, can ever know the answer to that one! Sometimes I actually pity you for not being able to see the beauty of the world in the same way we do. Really, our vision of the world can be incredible, just incredible ...


When you see an object, it seems that you see it as an entire thing first, and only afterwards do its details follow on.... But for people with autism, the details jump straight out at us first of all, and then only gradually, detail by detail, does the whole image sort of float up into focus.


Every single thing has its own unique beauty. People with autism get to cherish this beauty, as if it's a kind of blessing given to us.”
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“I’m a little scared, Grizz. Actually, more nervous than scared.” I tilted my head up to him, hands damp. “I know you have experience. I have none. I’m afraid you’ve built me up in your head to an ideal I can’t live up to. I don’t want to disappoint you.”
― Beth Flynn, quote from Nine Minutes

“There’s no such thing as an unbreakable scientific rule, because, sooner or later, they all seem to get broken. Or to change.”
― Madeleine L'Engle, quote from Many Waters

“her all the way to the crossroads, and I think it more than adequate.” Everyone gaped at her like she was mad. “Our goal,” she continued, “was to distract the king, was it not? To distract the king and those who serve him, to send them on a merry chase. It would have been nice to meet the lady, and to use her captivity to our advantage, but our first intention was to empty the tombs of its guards, yes?” Immerez calmed and nodded, and Sarge let out a breath of relief. Karigan’s own thoughts were awhirl. They kidnapped Estora just to distract the king? To empty the tombs? What were they up to? “Who are you?” she asked the woman. The woman did not answer, but withdrew a pendant from beneath her chemise. It was crudely made of iron, but shaped into a design Karigan knew well: a dead tree. “Second Empire,” she whispered. She glanced at the onlookers. “You’re all Second Empire?” Some drew out pendants like the woman’s, and others raised their hands, palms outward, to show the tattoo of the dead tree. The old woman smiled kindly”
― Kristen Britain, quote from The High King's Tomb

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About BookQuoters

BookQuoters is a community of passionate readers who enjoy sharing the most meaningful, memorable and interesting quotes from great books. As the world communicates more and more via texts, memes and sound bytes, short but profound quotes from books have become more relevant and important. For some of us a quote becomes a mantra, a goal or a philosophy by which we live. For all of us, quotes are a great way to remember a book and to carry with us the author’s best ideas.

We thoughtfully gather quotes from our favorite books, both classic and current, and choose the ones that are most thought-provoking. Each quote represents a book that is interesting, well written and has potential to enhance the reader’s life. We also accept submissions from our visitors and will select the quotes we feel are most appealing to the BookQuoters community.

Founded in 2023, BookQuoters has quickly become a large and vibrant community of people who share an affinity for books. Books are seen by some as a throwback to a previous world; conversely, gleaning the main ideas of a book via a quote or a quick summary is typical of the Information Age but is a habit disdained by some diehard readers. We feel that we have the best of both worlds at BookQuoters; we read books cover-to-cover but offer you some of the highlights. We hope you’ll join us.