Wayne

“The assumption that animals are without rights and the illusion that our treatment of them has no moral significance is a positively outrageous example of Western crudity and barbarity. Universal compassion is the only guarantee of morality.”
― Arthur Schopenhauer, The Basis of Morality

“He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.”
― Emmanuel Kant

“If we cut up beasts simply because they cannot prevent us and because we are backing our own side in the struggle for existence, it is only logical to cut up imbeciles, criminals, enemies, or capitalists for the same reasons.”
― C.S. Lewis, God in the Dock: Essays on Theology and Ethics

“The question is not, "Can they reason?" nor, "Can they talk?" but "Can they suffer?”
― Jeremy Bentham (An Introduction to the Principles of Morals and Legislation (Philosophical Classics), The Principles of Morals and Legislation