“I ask at what part of its curved motion the moving cause will leave the thing moved and moveable.”

— Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.

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Leonardo Da Vinci 363

Italian Renaissance polymath 1452–1519

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“It is not given to a cylinder to move everywhere by its own motion,”

Marcus Aurelius book Meditations

X, 33
Meditations (c. 121–180 AD), Book X
Context: It is not given to a cylinder to move everywhere by its own motion, nor yet to water nor to fire nor to anything else which is governed by nature or an irrational soul, for the things which check them and stand in the way are many. But intelligence and reason are able to go through everything that opposes them, and in such manner as they are formed by nature and as they choose. Place before thy eyes this facility with which the reason will be carried through all things, as fire upwards, as a stone downwards, as a cylinder down an inclined surface, and seek for nothing further. For all other obstacles either affect the body only, which is a dead thing; or, except for opinion and the yielding of reason itself, they do not crush nor do any harm of any kind; for if they did, he who felt it would immediately become bad.

“I tell you that if natural bodies have it from Nature to be moved by any movement, this can only be circular motion, nor is it possible that Nature has given to any of its integral bodies a propensity to be moved by straight motion. I have many confirmations of this proposition, but for the present one alone suffices, which is this. I suppose the parts of the universe to be in the best arrangement, so that none is out of its place, which is to say that Nature and God have perfectly arranged their structure. This being so, it is impossible for those parts to have it from Nature to be moved in straight, or in other than circular motion, because what moves straight changes place, and if it changes place naturally, then it was at first in a place preternatural to it, which goes against the supposition. Therefore, if the parts of the world are well ordered, straight motion is superfluous and not natural, and they can only have it when some body is forcibly removed from its natural place, to which it would then return by a straight line, for thus it appears that a part of the earth does [move] when separated from its whole. I said "it appears to us," because I am not against thinking that not even for such an effect does Nature make use of straight line motion.”

Galileo Galilei (1564–1642) Italian mathematician, physicist, philosopher and astronomer

A note on this statement is included by Stillman Drake in his Galileo at Work, His Scientific Biography (1981): Galileo adhered to this position in his Dialogue at least as to the "integral bodies of the universe." by which he meant stars and planets, here called "parts of the universe." But he did not attempt to explain the planetary motions on any mechanical basis, nor does this argument from "best arrangement" have any bearing on inertial motion, which to Galileo was indifference to motion and rest and not a tendency to move, either circularly or straight.
Letter to Francesco Ingoli (1624)

“Motion however will not help unless we have things moving.”

Simon Blackburn (1944) British academic philosopher

Source: Think (1999), Chapter Seven, The World, p. 244

“What is it to make progress in religion? Progress is not only action but moving onward. A door turning upon its hinges is in a state of motion, but it never advances. A chariot moving upon wheels is not only in motion, but goes onward. The conduct of some persons in religion resembles the former — there is action, but no advancement; they move, but it is on hinges, not on wheels.”

John Angell James (1785–1859) British abolitionist

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 564.

“There will always be people who are ahead of the curve, and people who are behind the curve. But knowledge moves the curve.”

Bill James (1949) American baseball writer and statistician

The Mind of Bill James, 2006, p. 191

“Impetus is a power of the mover applied in a movable thing which causes the movable thing to move after it is separated from its mover.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

“Summer is the season of motion, winter is the season of form. In summer everything moves save the fixed and inert. Down the hill flows the west wind, making wavelets in the shorter grass and great billows in the standing hay; the tree in full leaf sways its heavy boughs below and tosses its leaves above; the weed by the gate bends and turns when the wind blows down the road. It is the shadow of moving things that we usually see, and the shadows are themselves in motion. The shadow of a branch, speckled through with light, wavers across the lawn, the sprawling shadow of the weed moves and sways across the dust.”

Henry Beston (1888–1968) American writer

Source: The Northern Farm: A Glorious Year on a Small Maine Farm

“[S]ince causes are four in number, to know them all is the business of the natural philosopher, who also referring to the cause why a thing is to all of them, viz. to matter, form, that which moves, and for the sake of which a thing subsists, physically assigns a reason. Frequently, however, three of these causes pass into one: for the cause why a thing is, and that for the sake of which it is, are one. But that which motion first originates, is in species the same with these… [T]here are three treatises; once concerning that which is immoveable; another concerning that which is moved, indeed, but is incorruptible; and a third concerning corruptible natures. So the cause of why a thing is, is assigned by him who refers to matter, to essence, and to the first mover… But there are two principles which are naturally motive; of which, one is not physical, because it does not contain in itself the principle of motion. And if there is any thing which moves without being moved, it is of this kind; as is that which is perfectly immoveable, that which is the first of all things, together with essence and form: for it is the end, and that for the sake of which a thing subsists. So that since nature is for the sake of something, it is also necessary to know this cause.”

Aristotle book Physics

Book II, Ch. VII, pp. 124-126.
Physics

“Let the letters a b c denote the three angular points of a rectilineal triangle. If the point did move continuously over the lines ab, bc, ca, that is, over the perimeter of the figure, it would be necessary for it to move at the point b in the direction ab, and also at the same point b in the direction bc. These motions being diverse, they cannot be simultaneous. There-fore, the moment of presence of the movable point at vertex b, considered as moving in the direction ab, is different from the moment of presence of the movable point at the same vertex b, considered as moving in the same direction bc. But between two moments there is time; therefore, the movable point is present at point b for some time, that is, it rests. Therefore it does not move continuously, which is contrary to the assumption. The same demonstration is valid for motion over any right lines including an assignable angle. Hence a body does not change its direction in continuous motion except by following a line no part of which is straight, that is, a curve, as Leibnitz maintained.”

Immanuel Kant (1724–1804) German philosopher

Kant's Inaugural Dissertation (1770), Section III On The Principles Of The Form Of The Sensible World

“Let's leave the studio and go watch what moves..”

Albert Marquet (1875–1947) French artist

Marquet quoted by his wife Marcelle, in 'Exposition Albert Marquet', Musee Jenisch, p. 8; as cited in Albert Marquet and the Fauve movement; 1898-1908, Norris Judd, Thesis (A.B.), published by Sweet Briar College, May, 1976 – - digitized by Internet Archive, 2010 https://archive.org/details/albertmarquetfau00judd, p. 52
[comment of his wife: Marquet frequently said this to his companions; he rarely appeared in the studio of his art teacher Gustave Moreau for any length of time because he felt ill at ease there. He preferred to sketch in the streets of Paris with w:Charles Camoin or w:Henri Manguin.

“I ask at what part of its curved motion the moving cause will leave the thing moved and moveable.”

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Leonardo Da Vinci 363

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