„To endow animals with human emotions has long been a scientific taboo. But if we do not, we risk missing something fundamental, about both animals and us.“
— Frans de Waal Dutch primatologist and ethologist 1948
"Are We in Anthropodenial?" in Discover magazine (July 1997) http://discovermagazine.com/1997/jul/areweinanthropod1180
— Marc Bekoff, Animals Matter: A Biologist Explains Why We Should Treat Animals with Compassion and Respect
„Humans are the animals that manufacture weakness. We take wolves and we make them into dogs. We take buffalo and we make them into cows. We take stallions and we make them into geldings. We make things weak so that we may use them.“
— Mark Rowlands British philosopher 1962
The Philosopher and the Wolf https://books.google.it/books?id=FSJbBAAAQBAJ&pg=PT0 (Pegasus Books, 2009), ch. 4.
„And let the fear and dread of you be upon all of the animals of the earth.” Clearly, fear and dread were prescribed for the animals, but evidently it was forbidden among humans. By nature a human is superior to a brute animal, but not other humans.“
— Pope Gregory I Pope from 590 to 604 540 - 604
„The difference between animals and humans is that animals change themselves for the environment, but humans change the environment for themselves.“
— Ayn Rand Russian-American novelist and philosopher 1905 - 1982
„In light of the evolutionary links and behavioural similarities between humans and higher animals, it is hard to believe that belief-desire psychology could explain human behaviour, but not animal behaviour. If humans have beliefs, so do animals.“
— Stephen Stich American philosopher 1943
"Do Animals Have Beliefs?" (1979); as quoted in The Case for Animal Rights by Tom Regan (University of California Press, 2004), p. 36 https://books.google.it/books?id=Y0tWjRmxFE4C&pg=PA36.