“A person who already displays … cruelty to animals is also no less hardened towards men. We can already know the human heart, even in regard to animals.”
Part II, p. 212
Lectures on Ethics (1924)
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Immanuel Kant 200
German philosopher 1724–1804Related quotes

“As long as man eats animals how can cruelty to animals be removed.”
19th World Vegetarian Congress 1967

From an essay in Cruelties of Civilization (1897) as quoted in Roderick Nash, The Rights of Nature, University of Wisconsin Press, 1989, p. 29 https://books.google.it/books?id=f9tJZz6jDUIC&pg=PA29.

In Œuvres complètes (Paris: Anthropos, 1970–1972), t. I, 210-18; quoted in Matthieu Ricard, A Plea for the Animals, trans. Sherab Chödzin Kohn (Boulder, CO: Shambhala, 2016), p. 19 https://books.google.it/books?id=bTLuDAAAQBAJ&pg=PA19
Testament: Memoir of the Thoughts and Sentiments of Jean Meslier

Michael Gove: I'll make Brexit work for animals too https://www.bbc.co.uk/news/uk-politics-42313313, BBC News, 12 December 2017
2017

Source: Racial Hygiene: Medicine Under the Nazis, 1988, p. 277