"We cannot have two hearts, one for the animals and one for men. In cruelty towards the former and cruelty to the latter there is no difference but in the victim."

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I believe that pity is a law like justice, and that kindness is a duty like uprightness. That which is weak has a right to the kindness and pity of that which is strong. In the relations of man with the animals...there is a great ethic, scarcely perceived as yet, which will at length break through into the light, and which will be the corollary and the complement to humans ethics. Are there not here unsounded depths for the thinker? Is one to think oneself mad because one has the sentiment of universal pity in one's heart?

— Victor Hugo