“When a body is let fall from a higher position to lower one, it has, at the instant when it is let go, energy of motion; but it gains, in falling, as much energy of motion as it loses energy of position. It is found that the sum of energy of motion and energy of position is always constant. ...Energy is a quantity which can be greater or less but has no direction. ...This constancy is expressed by including them in common name of Energy, and saying that energy is conserved, or is indestructible. This form of speech might be applied to other cases of alternate immortality, where one of two things comes into existence on disappearance of the other.”

— William Kingdon Clifford

"Energy and Force" (Mar 28, 1873)

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William Kingdon Clifford 48

English mathematician and philosopher 1845–1879

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“Energy is of two kinds: 1. Energy of motion; 2. Energy of position.”

William Kingdon Clifford (1845–1879) English mathematician and philosopher

"Energy and Force" (Mar 28, 1873)

“Other qualities of bodies are connected with simple energy of motion and energy of position. Such is heat, which we find by experiment can be turned into work. Finding it convertible with energy, we call it a form of energy. ...But as to heat, it is further established by experiment that in this case the energy of motion does really persist as such. Thus a gas consists of molecules flying about with velocity, rotating and vibrating, and so having energy motion. All this energy of motion is what we call heat, and thus heat is a repetition of a known meaning of energy. Again, heat exists between a radiating body and the thing it warms; now the intermediate space is filled by the luminiferous ether, which, being elastic, has in its ultimate parts both energy of motion energy of position. In these forms the heat exists in the space in question.”

William Kingdon Clifford (1845–1879) English mathematician and philosopher

"Energy and Force" (Mar 28, 1873)

“The whole science of heat is founded Thermometry and Calorimetry, and when these operations are understood we may proceed to the third step, which is the investigation of those relations between the thermal and the mechanical properties of substances which form the subject of Thermodynamics. The whole of this part of the subject depends on the consideration of the Intrinsic Energy of a system of bodies, as depending on the temperature and physical state, as well as the form, motion, and relative position of these bodies. Of this energy, however, only a part is available for the purpose of producing mechanical work, and though the energy itself is indestructible, the available part is liable to diminution by the action of certain natural processes, such as conduction and radiation of heat, friction, and viscosity. These processes, by which energy is rendered unavailable as a source of work, are classed together under the name of the Dissipation of Energy.”

James Clerk Maxwell (1831–1879) Scottish physicist

Theory of Heat http://books.google.com/books?id=DqAAAAAAMAAJ "Preface" (1871)

“Being positive is attracting good energy to you, without needing to suck energy from others.”

Valter Bitencourt Júnior (1994) Brazilian poet and writer

“Positive energy heals everything.”

Ralph Smart

“As we can not give a general definition of energy, the principle of the conservation of energy signifies simply that there is something which remains constant.”

Henri Poincaré book The Value of Science

Comme nous ne pouvons pas donner de l'énergie une définition générale, le principe de la conservation de l'énergie signifie simplement qu'il y a quelque chose qui demeure constant.
Source: The Value of Science (1905), Ch. 10: Is Science artificial?

“The quantity of energy that ceased to "fall in" is the system's entropy.”

Buckminster Fuller (1895–1983) American architect, systems theorist, author, designer, inventor and futurist

130.01 http://www.rwgrayprojects.com/synergetics/s01/p3000.html
1970s, Synergetics: Explorations in the Geometry of Thinking (1975), "Synergy" onwards
Context: Critical proximity occurs where there is angular transition from "falling back in" at 180-degree to 90-degree orbiting—which is precession. (Gravity may be described as "falling back in" at 180 degrees.) The quantity of energy that ceased to "fall in" is the system's entropy. Critical proximity is when it starts either "falling in" or going into orbit, which is the point where either entropy or antientropy begins. An aggregate of "falling ins" is a body. What we call an object or an entity is always an aggregate of interattracted entities; it is never a solid. And the critical proximity transition from being an aggregate entity to being a plurality of separate entities is precession, which is a "peeling off" into orbit rather than falling back in to the original entity aggregate. This explains entropy intimately.

“There is… something which is in energy only; and there is something which is both in energy and capacity. …of relatives, one is predicated as according to excess and defect: another according to the effective and passive, and, in short, the motive, and that which may be moved… Motion, however, has not a substance separate from things… But each of the categories subsists in a twofold manner in all things. Thus… one thing pertaining to it is form, and another privation. …So the species of motion and mutation are as many as those of being. But since in every genus of things, there is that which is in entelecheia, and that which is in capacity; motion is the entelecheia of that which is in capacity… That there is energy, therefore, and that a thing then happens to be moved, when this energy exists, and neither prior nor posterior to it, is manifest. … [N]either motion nor mutation can be placed in any other genus; nor have those who have advanced a different opinion concerning it spoken rightly. …for by some motion is said to be difference, inequality, and non-being; though it is not necessary that any of these should be moved… Neither is mutation into these, nor from these, rather than from their opposites. …The cause, however, why motion appears to be indefinite, is because it can neither be simply referred to the capacity, nor to the energy of beings. …[I]t is difficult to apprehend what motion is: for it is necessary to refer it either to privation, or to capacity, or to simple energy; but it does not appear that it can be any of these. The above-mentioned mode, therfore remains, viz. that it is a certain energy; but… difficult to be perceived, but which may have a subsistence.”

Aristotle book Physics

Book III, Ch. I, pp. 137-147.
Physics

“Another conspicuous failure of classical mechanics was with one aspect of the problem of radiation. …Imagine a crowd of steel balls rolling about on a steel floor. …There must… be a steady leakage of energy from… causes, such as air resistance and the friction of the floor, so the balls will eventually lose energy, and, after no great length of time, will be found standing at rest on the floor. The energy of their motion seems to have been lost… most of it has been transformed into heat. The classical mechanics predicts that this must happen; it shows that all energy of motion, except possibly a minute fraction of the whole, must be transformed into heat whenever such a transformation is physically possible. It is because of this that perpetual-motion machines are a practical impossibility.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“The energy of hatred won't get you anywhere; but the energy of forgiveness, which reveals itself through love, will transform your life in a positive way.”

Paulo Coelho book The Zahir

Source: The Zahir

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William Kingdon Clifford 48

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