Isaac Newton Quotes and Quotation

(25 December 1642 – 20 March 1727 by the Julian calendar then in use; or 4 January 1643 – 31 March 1727 by the Gregorian calendar) English and

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If I have been able to see further, it was only because I stood on the shoulders of giants.
- Letter to Robert Hooke (February 5, 1675) (using Julian Calendar with March 25 rather than January 1 as New Years Day, equivalent to February 15, 1676 by Gregorian reckonings)
I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis, and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.
- Letter to Robert Hooke (February 5, 1675)
Hypotheses non fingo.
- I frame no hypotheses.
- Principia Mathematica (1687)
- A statement that the law of universal gravitation was a (more fundamental) empirical law, and that he proposed no hypotheses on how gravity could propagate.
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
- Principia Mathematica (1687) Laws of Motion I
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
- Principia Mathematica (1687) Laws of Motion II
To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
- Principia Mathematica (1687) Laws of Motion III
Are not gross bodies and light convertible into one another; and may not bodies receive much of their activity from the particles of light which enter into their composition? The changing of bodies into light, and light into bodies, is very conformable to the course of Nature, which seems delighted with transmutations.
- Opticks (1730)
"The folly of Interpreters has been, to foretell times and things by this Prophecy, as if God designed to make them Prophets. By this rashness they have not only exposed themselves, but brought the Prophecy also into contempt.

The design of God was much otherwise. He gave this and the Prophecies of the Old Testament, not to gratify mens curiosities by enabling them to foreknow things, but that after they were fulfilled they might be interpreted by the event, and his own Providence, not the Interpreters, be then manifested thereby to the world."
- Source: Observations Upon The Apocalypse Of St. John (published posthumously 1733)
“I have studied these things — you have not.”
- Reported as Newton's response, whenever Sir Edmond Halley would say anything disrespectful of religion, by Sir David Brewster in The Life of Sir Isaac Newton (1831). This has often been quoted in recent years as having been a statement specifically defending Astrology. Newton wrote extensively on the importance of Prophecy, and studied Alchemy, but there is little evidence that he took favourable notice of Astrology. Brewster attributes the anecdote to the astronomer Nevil Maskelyne who passed it on to Oxford professor Stephen Peter Rigaud.
I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
- Memoirs of the Life, Writings, and Discoveries of Sir Isaac Newton (1855) by Sir David Brewster (Volume II. Ch. 27)
Newton’s reflecting telescope was an extraordinary achievement. His first telescope was about 6 inches long with a 2 inch mirror and magnified by forty times. He was proud of his handiwork even sixty years later, when Conduitt reports a conversation:

"I asked him where he had it made, he said he made it himself, and when I asked him where he got his tools said he made them himself and laughing added if I had staid for other people to make my tools and things for me, I had never made anything..."

- The Foundations of Newton’s Alchemy Cambridge University Press (1975) [1]

Attributed:

In the absence of any other proof, the thumb alone would convince me of God's existence.
- Quoted in Wisdom (2002). by Des MacHale
Numero pondere et mensura Deus omnia condidit.
- God created everything by number, weight and measure.
Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.
To explain all nature is too difficult a task for any one man or even for any one age. 'Tis much better to do a little with certainty, and leave the rest for others that come after you, than to explain all things.
- Quoted in Calculus Gems (1992) G Simmons
"Plato is my friend, Aristotle is my friend, but my best friend is truth."
- Head of Newton's Quaestiones Quaedam Philosophicae (Certain Philosophical Questions), ca. 1664.

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