Jeremy Bentham livro An Introduction to the Principles of Morals and Legislation
The question is not, Can they reason? nor, Can they talk? but Can they suffer?<br>An Introduction to the Principles of Morals and Legislation - Vol II Página 236 http://books.google.com/books?id=pEgJAAAAQAAJ&pg=PA236, de Jeremy Bentham - Publicado por W. Pickering, 1823 - 560 páginas.