“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.”

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

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Leonardo Da Vinci363

Italian Renaissance polymath 1452–1519

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“Every body that is moved continues to move so long as the impression of the force of its mover is retained in it, therefore the movement of this wing with violence… will come to move the whole bird with it until the impetus of the moved air has been consumed.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

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

“Zeus, first cause, prime mover; for what thing without Zeus is done among mortals?”

Aeschylus Agamemnon

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“The air which is struck with most swiftness by the movable thing is compressed to the greatest degree in itself.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

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

“Whatever is in motion must be put in motion by another. If that by which it is put in motion be itself put in motion, then this also must needs be put in motion by another, and that by another again. But this cannot go on to infinity, because then there would be no first mover, and, consequently, no other mover; seeing that subsequent movers move only inasmuch as they are put in motion by the first mover; as the staff moves only because it is put in motion by the hand. Therefore it is necessary to arrive at a first mover, put in motion by no other; and this everyone understands to be God.”

Thomas Aquinas book Summa Theologica

I, q. 2, art. 3
Summa Theologica (1265–1274)

“[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.”

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Book II, Ch. VII, pp. 124-126.
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“Yet we are the movers and shakers
Of the world for ever, it seems.”

Arthur O'Shaughnessy Ode

Music and Moonlight (1874), Ode
Context: We are the music makers,
And we are the dreamers of dreams,
Wandering by lone sea-breakers,
And sitting by desolate streams; —
World-losers and world-forsakers,
On whom the pale moon gleams:
Yet we are the movers and shakers
Of the world for ever, it seems.

“Those people who develop the ability to continuously acquire new and better forms of knowledge that they can apply to their work and to their lives will be the movers and shakers in our society for the indefinite future.”

Brian Tracy (1944) American motivational speaker and writer