“Criminal history shows us how many torturers of men, and murderers, have first been torturers of animals. The manner in which a nation in the aggregate treats animals, is one chief measure of its real civilization. The Latin races, as we know, come forth badly from this examination; we Germans, not half well enough. Buddhism has done more in this direction than Christianity, and Schopenhauer more than all ancient and modern philosophers together. The warm sympathy with sentient Nature which pervades all the writings of Schopenhauer, is one of the most pleasing aspects of his thoroughly intellectual, yet often unhealthy and unprofitable philosophy.”
The Old Faith and the New (Der alte und der neue Glaube, 1872, translated from the 6th edition by M. Blind, New York: Henry Holt & Co., 1873), vol. II, part IV, ch. 71, pp. 59 https://archive.org/stream/oldfaithnewconfe01stra#page/59/mode/2up-60.
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David Strauss 1
German theologian 1808–1874Related quotes
section 20
quote is from Prayer for the Departed by Armand Godoy
The Myth of Modernity (1946)

Original: Para qué andar con medias tintas, los animales saben mucho más que las personas, ante todo porque sienten con más libertad que la mayoría de estas y, por ello, como dice Kafka, son poseedores de todo el conocimiento acerca de esta vida. Solo que son muy humildes para hacer gala de ello.
Source: Baroja, José. (2020). "Orfeo". En El lado oscuro de la sombra y otros ladridos. Lima: Ediquid, ISBN:978-980-7641-67-8; p. 40.
Why this professor's climate-crisis solution is rankling Twitter: 'The worst thing you can do is have a child' https://www.yahoo.com/lifestyle/why-professor-climate-crisis-solution-rankling-twitter-155305526.html (13 February 2020) Yahoo!Life

All tyrants, past, present and future, are powerless to bury the truths in these declarations, no matter how extensive their legions, how vast their power and how malignant their evil.
1960s, Emancipation Proclamation Centennial Address (1962)

Kosmos (1847)
Context: If we would indicate an idea which, throughout the whole course of history, has ever more and more widely extended its empire, or which, more than any other, testifies to the much-contested and still more decidedly misunderstood perfectibility of the whole human race, it is that of establishing our common humanity — of striving to remove the barriers which prejudice and limited views of every kind have erected among men, and to treat all mankind, without reference to religion, nation, or color, as one fraternity, one great community, fitted for the attainment of one object, the unrestrained development of the physical powers. This is the ultimate and highest aim of society, identical with the direction implanted by nature in the mind of man toward the indefinite extension of his existence. He regards the earth in all its limits, and the heavens as far as his eye can scan their bright and starry depths, as inwardly his own, given to him as the objects of his contemplation, and as a field for the development of his energies. Even the child longs to pass the hills or the seas which inclose his narrow home; yet, when his eager steps have borne him beyond those limits, he pines, like the plant, for his native soil; and it is by this touching and beautiful attribute of man — this longing for that which is unknown, and this fond remembrance of that which is lost — that he is spared from an exclusive attachment to the present. Thus deeply rooted in the innermost nature of man, and even enjoined upon him by his highest tendencies, the recognition of the bond of humanity becomes one of the noblest leading principles in the history of mankind.

1900s, Letter to Winfield T. Durbin (1903)