Isaac Newton: Trending quotes (page 5)

Actually a statement by American advertising executive and author Howard W. Newton (1903–1951); attributions to Isaac are relatively recent, those to Howard date at least to Sylva Vol. 1-3 (1945), p. 57 https://books.google.com/books?id=-QUcAQAAMAAJ&q=%22Tact+is+the+knack+of+making+a+point+without+making+an+enemy%22&dq=%22Tact+is+the+knack+of+making+a+point+without+making+an+enemy%22&hl=en&sa=X&ei=jtmwVJrZN43ksATPmID4BA&ved=0CNkBEOgBMCQ, where it is cited to an earlier publication in Redbook.
Misattributed
Variant: Tact is the art of making a point without making an enemy.
Variant: Tact is the knack of making a point without making an enemy.

Laws of Motion, III
Philosophiae Naturalis Principia Mathematica (1687)
Context: 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.

Philosophiae Naturalis Principia Mathematica (1687), Scholium Generale (1713; 1726)
Source: The Principia: Mathematical Principles of Natural Philosophy
Context: 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 form'd by the like wise counsel, must be all subject to the dominion of One; especially, since the light of the fixed Stars is of the same nature with the light of the Sun, and from every system light passes into all the other systems. And lest the systems of the fixed Stars should, by their gravity, fall on each other mutually, he hath placed those Systems at immense distances one from another.

Cited in Rules for methodizing the Apocalypse, Rule 9, from a manuscript published in The Religion of Isaac Newton (1974) by Frank E. Manuel, p. 120, as quoted in Socinianism And Arminianism : Antitrinitarians, Calvinists, And Cultural Exchange in Seventeenth-Century Europe (2005) by Martin Mulsow, Jan Rohls, p. 273.
As quoted in God in the Equation : How Einstein Transformed Religion (2002) by Corey S. Powell, p. 29
Variant: Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.

Such a statement is indicated as his response to a question regarding the financial fiasco known as the South Sea Bubble; the earliest mention of this famous anecdote appears to be from manuscripts of the Second Memorandum Book (1756) of Joseph Spence, first published in Anecdotes, Observations, and Characters, of Books and Men (1820) https://archive.org/details/anecdotesobserv00singgoog edited by in Samuel Weller Singer; a Lord Radnor is quoted as saying:
When Sir Isaac Newton was asked about the continuance of the rising of South Sea stock? — He answered, "that he could not calculate the madness of the people."
Variants:
I can calculate the motions of erratic bodies, but not the madness of a multitude.
As quoted in "Mammon and the Money Market", in The Church of England Quarterly Review (1850), p. 142 http://books.google.com/books?id=s_cDAAAAQAAJ&pg=PA142&dq=%22but+not+the+madness%22&hl=en&ei=nUtbTfuoCYG6ugPFi4n4DA&sa=X&oi=book_result&ct=book-preview-link&resnum=1&ved=0CCkQuwUwAA#v=onepage&q=%22but%20not%20the%20madness%22&f=false
I can calculate the motions of the heavenly bodies, but not the madness of people.
I can calculate the motions of heavenly bodies but not the madness of men.
I can calculate the movement of the stars, but not the madness of men.
Disputed

Query 28 : Are not all Hypotheses erroneous in which Light is supposed to consist of Pression or Motion propagated through a fluid medium?
Opticks (1704)
Context: To make way for the regular and lasting Motions of the Planets and Comets, it's necessary to empty the Heavens of all Matter, except perhaps some very thin Vapours, Steams or Effluvia, arising from the Atmospheres of the Earth, Planets and Comets, and from such an exceedingly rare Æthereal Medium … A dense Fluid can be of no use for explaining the Phænomena of Nature, the Motions of the Planets and Comets being better explain'd without it. It serves only to disturb and retard the Motions of those great Bodies, and make the frame of Nature languish: And in the Pores of Bodies, it serves only to stop the vibrating Motions of their Parts, wherein their Heat and Activity consists. And as it is of no use, and hinders the Operations of Nature, and makes her languish, so there is no evidence for its Existence, and therefore it ought to be rejected. And if it be rejected, the Hypotheses that Light consists in Pression or Motion propagated through such a Medium, are rejected with it.
And for rejecting such a Medium, we have the authority of those the oldest and most celebrated philosophers of ancient Greece and Phoenicia, who made a vacuum and atoms and the gravity of atoms the first principles of their philosophy, tacitly attributing Gravity to some other Cause than dense Matter. Later Philosophers banish the Consideration of such a Cause out of natural Philosophy, feigning Hypotheses for explaining all things mechanically, and referring other Causes to Metaphysicks: Whereas the main Business of natural Philosophy is to argue from Phenomena without feigning Hypotheses, and to deduce Causes from Effects, till we come to the very first Cause, which certainly is not mechanical.

Arithmetica Universalis (1707), p.251