“The more we devote ourselves to observing animals and their behaviour, the more we love them, on seeing how gready they care for their young; in such a context, we cannot even contemplate cruelty to a wolf. Leibnitz put the grub he had been observing back on the tree with its leaf, lest he should be guilty of doing any harm to it. It upsets a man to destroy such a creature for no reason, and this tenderness is subsequendy transferred to man.”

— Immanuel Kant

Part II, pp. 212-213
Lectures on Ethics (1924)

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Immanuel Kant 200

German philosopher 1724–1804

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