“It is not given to a cylinder to move everywhere by its own motion,”
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.
Help us to complete the source, original and additional information
Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

“I ask at what part of its curved motion the moving cause will leave the thing moved and moveable.”
The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.

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

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)

Source: Striking Thoughts (2000), p. 42

Response to questionnaire circulated to the Cubists by Amédée Ozenfant and Le Corbusier, editors of L'Esprit Nouveau # 5 (February 1921), pp. 533-534; trans. Douglas Cooper in Daniel-Henry Kahnweiler, Juan Gris, His Life and Work (1947)
“Motion however will not help unless we have things moving.”
Source: Think (1999), Chapter Seven, The World, p. 244