"The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit."

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The animals you eat are not those who devour others; you do not eat the carnivorous beasts, you take them as your pattern. You only hunger for the sweet and gentle creatures which harm no one, which follow you, serve you, and are devoured by you as the reward of their service.

— Jean-Jacques Rousseau