Daphne

“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

“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