Source: The Social Psychology of Organizations (1966), p. 16-17
“For what is life but organized energy?”
Out of the Sun, p. 656
2000s and posthumous publications, The Collected Stories of Arthur C. Clarke (2001)
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Arthur C. Clarke 207
British science fiction writer, science writer, inventor, u… 1917–2008Related quotes

Cook, Gareth (interviewer), "The Power of Introverts: A Manifesto for Quiet Brilliance," Scientific American, January 24, 2012.

“Life engenders life. Energy creates energy. It is by spending oneself that one becomes rich.”
As quoted in Madam Sarah (1966) by Cornelia Otis Skinner, p. xvi

"Einstein's Reply to Criticisms" (1949), The World As I See It (1949)
Context: What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion. Is there any sense then, you ask, in putting it? I answer, the man who regards his own life and that of his fellow creatures as meaningless is not merely unfortunate but almost disqualified for life.

As quoted in Love's Way (1918) by Orison Swett Marden, p. 175; no earlier citation of this to Browning has been located.
Disputed
Variant: Love is energy of life.
Source: Complexity and Postmodernism (1998), p. 4; as cited in Richard Andrews et al. (2012, p. 129)
Energy Flow in Biology: Biological Organization as a Problem in Thermal Physics (1968), p. 2.
Italics are in the original. Later quoted on the inside front cover of The Last Whole Earth Catalog.

“The energy of the mind is the essence of life.”
Source: The Philosophy of Aristotle

Viktor Schauberger in a letter to Aloys Kokaly in 1953 - Implosion Magazine No. 29, p. 22 (Callum Coats: Energy Evolution)
Implosion Magazine

Lila (1991)
Context: The Second Law of Thermodynamics states that all energy systems run down like a clock and never rewind themselves. But life not only 'runs up,' converting low energy sea-water, sunlight and air into high-energy chemicals, it keeps multiplying itself into more and better clocks that keep 'running up' faster and faster. Why, for example, should a group of simple, stable compounds of carbon, hydrogen, oxygen and nitrogen struggle for billions of years to organize themselves into a professor of chemistry? What's the motive? If we leave a chemistry professor out on a rock in the sun long enough the forces of nature will convert him into simple compounds of carbon, oxygen, hydrogen and nitrogen, calcium, phosphorus, and small amounts of other minerals. It's a one-way reaction. No matter what kind of chemistry professor we use and no matter what process we use we can't turn these compounds back into a chemistry professor. Chemistry professors are unstable mixtures of predominantly unstable compounds which, in the exclusive presence of the sun's heat, decay irreversibly into simpler organic and inorganic compounds. That's a scientific fact. The question is: Then why does nature reverse this process? What on earth causes the inorganic compounds to go the other way? It isn't the sun's energy. We just saw what the sun's energy did. It has to be something else. What is it?