Mill writes that thinkers still debate the foundations of morality and constantly argue over the definition of good and evil. He tells the reader that Plato wrote that Socrates first postulated the idea of ​​utilitarianism in his writings against the Sophists (Mill 1). He says that man must test what is good and evil apparently against his own instinct, and that this instinct can only give general principles of moral judgment (Mill 2). He writes that the intuitive and deductive schools taught that there is a moral science but did not have a first principle. Rather, they relied only on secondary principles to guide moral action. Mill writes that utilitarian arguments are indispensable to moralists and that the greatest happiness principle has influenced even those who openly reject it (Mill