"To my apprehension, every act by which, without prospect of preponderant good, pain is knowingly and willingly produced in any being whatsoever, is an act of cruelty; and, like other bad habits, the more the correspondent habit is indulged in, the stronger it grows, and the more frequently productive of its bad fruit. I am unable to comprehend how it should be, that to him to whom it is a matter of amusement to see a dog or a horse suffer, it should not be matter of like amusement to see a man suffer; seeing, as I do, how much more morality as well as intelligence, an adult quadruped of those and many other species has in him, than any biped has for some months after he has been brought into existence."