“It should be borne in mind that electrical energy obtained by harnessing a waterfall is probably fifty times more effective than fuel energy. Since this is the most perfect way of rendering the sun's energy available, the direction of the future material development of man is clearly indicated.”

Interview with Left Voice, 2017

"William McDonough: Godfather of Green", WNYC Studio 360 (18 March 2008).
Context: There's probably 5000 times more solar energy than the humans will ever need. We could cover our highways with solar collectors to make ribbons of energy, and I think that it's really the largest job creation program in the history of the planet that's in front of us. It's a celebration of the abundance of human creativity combined with the abundance of the natural world.

As quoted in "Atom Energy Hope is Spiked By Einstein / Efforts at Loosing Vast Force is Called Fruitless," Pittsburgh Post-Gazette (29 December 1934); it was only after the breakthroughs by Enrico Fermi and others in producing nuclear chain reactions that the use of nuclear power became plausible.
1930s

Speaking & Features, Standing Up To Goliath
Context: Now is the time for change. We cannot drill our way out of the energy crisis. The era of fossil fuels is over. We must invest in renewable energy. And we must not delay.

Revolution (2014)

From the film Moog (2004)
Context: The more you get into material and matter, all you realize is in matter, there is energy. There is a blur between energy and consciousness. All material is conscious to some extent or another. All material can respond to some extent or another to vibrations of energy that is different to energy you learn about in physics. There are all sorts of reliable information now on people and animal being able to be able to effect the operations of machines—even of computers—and I think that has great implications for what goes on between a musician and his instrument. There is a level of reality where there is no time, and there is no space, there is just energy. And we have contact with that through the intermediate layers, so, if the right channels—if the right connections are established, I don’t see why a piece of matter, a piece of broken glass or and old record can’t make contact through this very high level of reality that has access to everything past and future. I suppose my instruments do retain some sort of memory of me. I know that when I’m working on them I feel (not explicitly, I don’t hear voices in my head or anything) that I’m making a connection with it. The circuit diagram, that is then converted into a circuit board, which then becomes a part of an instrument is something that is a record that I made. So I guess in that sense it is something that is certainly a memory.

Source: 1980s, Evolutionary Economics, 1981, p. 27

"The Evolution of Chastity" (February 1934), as translated in Toward the Future (1975) edited by by René Hague, who also suggests "space" as an alternate translation of "the ether."
Variants:
"One day after mastering the winds, the waves, the tides and gravity" — after all the scientific and technological achievements — "we shall harness for God the energies of love. And then, for the second time in the history of the world, man will have discovered fire."
As quoted by R. Sargent Shriver, Jr. in his speech accepting the nomination as the Democratic candidate for vice president, in Washington, D. C. (8 August 1972); this has sometimes been published as if Shriver's interjection "after all the scientific and technological achievements" were part of the original statement, as in The New York Times (9 August 1972), p. 18
What paralyzes life is lack of faith and lack of audacity. The difficulty lies not in solving problems but identifying them.
As translated in The The Ignatian Tradition (2009) edited by Kevin F. Burke, Eileen Burke-Sullivan and Phyllis Zagano, p. 86
Love is the only force which can make things one without destroying them. … Some day, after mastering the winds, the waves, the tides and gravity, we shall harness for God the energies of love, and then, for the second time in the history of the world, man will have discovered fire.
As quoted in Seed Sown : Theme and Reflections on the Sunday Lectionary Reading (1996) by Jay Cormier, p. 33
The day will come when, after harnessing space, the winds, the tides, gravitation, we shall harness for God the energies of love. And, on that day, for the second time in the history of the world, humanity will have discovered fire.
As quoted in Fire of Love : Encountering the Holy Spirit (2006) by Donald Goergen, p. 92
The day will come when, after harnessing space, the winds, the tides, gravitation, we shall harness for God the energies of love. And, on that day, for the second time in the history of the world, man will have discovered fire.
As quoted in Read for the Cure (2007) by Eileen Fanning, p. v
Variant: Someday, after mastering the winds, the waves, the tides and gravity, we shall harness for God the energies of love, and then, for a second time in the history of the world, man will have discovered fire.
Context: What paralyzes life is lack of faith and lack of audacity. The difficulty lies not in solving problems but expressing them. And so we cannot avoid this conclusion: it is biologically evident that to gain control of passion and so make it serve spirit must be a condition of progress. Sooner or later, then, the world will brush aside our incredulity and take this step : because whatever is the more true comes out into the open, and whatever is better is ultimately realized. The day will come when, after harnessing the ether, the winds, the tides, gravitation, we shall harness for God the energies of love. And, on that day, for the second time in the history of the world, man will have discovered fire.