"I am sometimes asked, 'Why do you spend so much of your time and money talking about kindness to animals when there is so much cruelty to men?' I answer: 'I am working at the roots.'"

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cruelty to animals is contrary to man's duty to himself, because it deadens in him the feeling of sympathy for their sufferings, and thus a natural tendency that is very useful to morality in relation to other human beings is weakened.

— Immanuel Kant