Helen Rose

“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

“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

“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

“I have from an early age abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.”
― Leonardo da Vinci