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A person who already displays … cruelty to animals is also no less hardened towards men. We can already know the human heart, even in regard to animals.

— Immanuel Kant Lectures on Ethics (1924)

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More quotes by Immanuel Kant

Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.

Critique of Practical Reason (1788)

Apart from moral conduct, all that man thinks himself able to do in order to become acceptable to God is mere superstition and religious folly.

There must be a seed of every good thing in the character of men, otherwise no one can bring it out.

The Educational Theory of Immanuel Kant (1904)

Natural science is throughout either a pure or an applied doctrine of motion.

Metaphysical Foundations of Natural Science (1786)

That all our knowledge begins with experience there can be no doubt.

Critique of Pure Reason (1781)

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All breathing, existing, living, sentient creatures should not be slain, nor treated with violence, nor abused, nor tormented, nor driven away.

Mahavira

A dog cannot relate his autobiography; however eloquently he may bark, he cannot tell you that his parents were honest but poor.

Bertrand Russell Human Knowledge: Its Scope and Limits (1948)

Histories are more full of Examples of the Fidelity of dogs than of Friends.

Alexander Pope

True human goodness, in all its purity and freedom, can come to the fore only when its recipient has no power.

Milan Kundera The Unbearable Lightness of Being (1984)

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Quote text and notes from Wikiquote: Immanuel Kant (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.