“The High-Intelligence Life Forms of the planet, of which there were at least three species, all of low technological achievement, they would ignore or enslave or extirpate, whichever was most convenient. For to an aggressive people only technology mattered.”

Source: How Mars might hold the secret to the origin of life https://www.ted.com/talks/nathalie_cabrol_how_mars_might_hold_the_secret_to_the_origin_of_life (March 2015)

Source: Cosmos: A Personal Voyage (1990 Update), Journeys in Space and Time [Episode 8], 54 min 55 sec
Context: Those worlds in space are as countless as all the grains of sand on all the beaches of the earth. Each of those worlds is as real as ours and every one of them is a succession of incidents, events, occurrences which influence its future. Countless worlds, numberless moments, an immensity of space and time. And our small planet at this moment, here we face a critical branch point in history, what we do with our world, right now, will propagate down through the centuries and powerfully affect the destiny of our descendants, it is well within our power to destroy our civilization and perhaps our species as well. If we capitulate to superstition or greed or stupidity we could plunge our world into a time of darkness deeper than the time between the collapse of classical civilization and the Italian Renaissance. But we are also capable of using our compassion and our intelligence, our technology and our wealth to make an abundant and meaningful life for every inhabitant of this planet.

Quoted in "The Olduvai Theory: Sliding Towards a Post-Industrial Stone Age" by Richard C. Duncan http://dieoff.org/page125.htm
Originally from Fred Hoyle, Of Men and Galaxies (Seattle: University of Washington Press, 1964).

Made in Japan (1986)

Source: https://books.google.com/books?id=Owc2nQEACAAJ&pg=PA8 pp. 8–9
Zero to One (2014)

Source: "The duality of technology" 1992, p. 408

Source: Infinite in All Directions (1988), Ch. 8 : Quick Is Beautiful, p. 135
Context: The technologies which have had the most profound effects on human life are usually simple. A good example of a simple technology with profound historical consequences is hay. Nobody knows who invented hay, the idea of cutting grass in the autumn and storing it in large enough quantities to keep horses and cows alive through the winter. All we know is that the technology of hay was unknown to the Roman Empire but was known to every village of medieval Europe. Like many other crucially important technologies, hay emerged anonymously during the so-called Dark Ages. According to the Hay Theory of History, the invention of hay was the decisive event which moved the center of gravity of urban civilization from the Mediterranean basin to Northern and Western Europe. The Roman Empire did not need hay because in a Mediterranean climate the grass grows well enough in winter for animals to graze. North of the Alps, great cities dependent on horses and oxen for motive power could not exist without hay. So it was hay that allowed populations to grow and civilizations to flourish among the forests of Northern Europe. Hay moved the greatness of Rome to Paris and London, and later to Berlin and Moscow and New York.

1990s, Schafer interview (1995)

Source: From 1980s onwards, Critical Path (1981)