“Can the human appropriation of nature ever achieve the elimination of violence, cruelty, and brutality in the daily sacrifice of animal life for the physical reproduction of the human race? To treat nature "for its own sake" sounds good, but it is certainly not for the sake of the animal to be eaten, nor probably for the sake of the plant. The end of this war, the perfect peace in the animal world — this idea belongs to the Orphic myth, not to any conceivable historical reality. In the face of the suffering inflicted by man on man, it seems terribly "premature" to campaign for universal vegetarianism or synthetic foodstuffs; as the world is, priority must be on human solidarity among human beings. And yet, no free society is imaginable which does not, under its "regulative idea of reason," make the concerted effort to reduce consistently the suffering which man imposes on the animal world.”
Source: Counterrevolution and Revolt (1972), Chapter "Nature and Revolution," in The Essential Marcuse: Selected Writings of Philosopher and Social Critic Herbert Marcuse, edited by Andrew Feenberg and William Leiss, Beacon Press, 2007, pp. 240 https://books.google.it/books?id=JqoyBgAAQBAJ&pg=PA240-241
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Herbert Marcuse 105
German philosopher, sociologist, and political theorist 1898–1979Related quotes

As quoted in The Life of Lord Kelvin (1910), by Silvanus Phillips, Volume 2, (2005 edition, . p. 1093)
Gentle reader, pardon this digression, my feelings commanded my pen.
The Genera Insectorum of Linnæus, Exemplified by Various Specimens English Insects drawn by Nature (1781)

B 374
Critique of Pure Reason (1781; 1787)
Context: A plant, an animal, the regular order of nature — probably also the disposition of the whole universe — give manifest evidence that they are possible only by means of and according to ideas; that, indeed, no one creature, under the individual conditions of its existence, perfectly harmonizes with the idea of the most perfect of its kind — just as little as man with the idea of humanity, which nevertheless he bears in his soul as the archetypal standard of his actions; that, notwithstanding, these ideas are in the highest sense individually, unchangeably, and completely determined, and are the original causes of things; and that the totality of connected objects in the universe is alone fully adequate to that idea.

Source: (1776), Book IV, Chapter I, p. 471.

Interview with Rynn Berry