Vom Schmetterling zur Doppelaxt: Die Umwertung von Weiblichkeit in unserer Kultur (1990), p. 9, 11.
Vom Schmetterling zur Doppelaxt (1990)
Context: Humans belong to the category of herding animals, due to which intra-species aggression at a life-endangering level is obviated. In other words: If, for some reason or another, severe conflicts [... ] of the kind common since the last circa four-and-a-half millennia would have occured during the time of our hominisation, our ancestors would have completely eradicated each other and homo sapiens would have never set foot on earth. For a species that in its individuals was so weak when confronted with many predators preying after them required support from its kind in order to survive. We possess neither claws nor fangs nor the strength to successfully withstand the larger carnivores all alone, however it is as a group that we may survive together though never without sacrifice and courage. When our non-human ancestors began living in packs in order to stand together when facing hazards, they developed a behaviour that we may term 'social intelligence', which is the ability to co-operate with one's species in order to maintain the well-being of all. Modern homo sapiens still possesses this potential, however our culture has effectively damaged it.
[... ]
It must have been a peaceful world, for early settlements at large exhibited no fortifications regarding human attacks. For maybe one or two millennia [after the end of the last glacial epoch], humans obviously lived an untroubled life under these social conditions.
“Some excuse seems necessary for the pain and loss which we occasion to brutes, by restraining them of their liberty, mutilating their bodies, and, at last, putting an end to their lives (which we suppose to be the whole of their existence), for our pleasure or conveniency.
The reasons alleged in vindication of this practice, are the following: that the several species of brutes being created to prey upon one another, affords a kind of analogy to prove that the human species were intended to feed upon them; that, if let alone, they would overrun the earth, and exclude mankind from the occupation of it; that they are requited for what they suffer at our hands, by our care and protection.
Upon which reasons I would observe, that the analogy contended for is extremely lame; since brutes have no power to support life by any other means, and since we have; for the whole human species might subsist entirely upon fruit, pulse, herbs, and roots, as many tribes of Hindoos actually do. The two other reasons may be valid reasons, as far as they go; for, no doubt, if man had been supported entirely by vegetable food, a great part of those animals which die to furnish his table, would never have lived: but they by no means justify our right over the lives of brutes to the extent in which we exercise it. What danger is there, for instance, of fish interfering with us, in the occupation of their element? or what do we contribute to their support or preservation?”
Vol. I, Book II, Ch. XI.
The Principles of Moral and Political Philosophy (1785)
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William Paley 15
Christian apologist, natural theologian, utilitarian 1743–1805Related quotes

1950s, The Russell-Einstein Manifesto (1955)

Speech https://web.archive.org/web/20070621205516/http://www.historycooperative.org/journals/jala/24.1/belz.html (1861)
1860s

Source: Zen and the Art of Motorcycle Maintenance (1974), Ch. 20
Context: In our highly complex organic state we advanced organisms respond to our environment with an invention of many marvelous analogues. We invent earth and heavens, trees, stones and oceans, gods, music, arts, language, philosophy, engineering, civilization and science. We call these analogues reality. And they are reality. We mesmerize our children in the name of truth into knowing that they are reality. We throw anyone who does not accept these analogues into an insane asylum. But that which causes us to invent the analogues is Quality. Quality is the continuing stimulus which our environment puts upon us to create the world in which we live. All of it. Every last bit of it.

“There is, in the human Breast, a social Affection, which extends to our whole Species.”
Letter to Abigail Adams http://scholarship.kentlaw.iit.edu/cgi/viewcontent.cgi?article=2785&context=cklawreview (19 October 1775). Reprinted in I ADAMS FAMILY CORRESPONDENCE 318 (L. Butterfield ed. 1963).
1770s

“Tragedy delights by affording a shadow of the pleasure which exists in pain.”
A Defence of Poetry http://www.bartleby.com/27/23.html (1821)

Lo que más interesante es en la naturaleza existen dos especies, unicamente dos especies que son expansionistas: el hombre y los insectos. Las demás especies son territoriales. El insecto es devorador, expansionista, hasta que se siegue expandiendo y no le importa. Y el hombre es así... las dos especies que van a acabar peleándose por el mundo van a ser insectos y hombres.
Interview with Guillermo del Toro. http://www.filmoteca.com/sec4/guidtoro.htm