"There are rules of conduct higher than caprice or individual interest. Each man has a knowledge of these rules, and it is sufficient for him to conform himself thereto. He is convinced that so to conform himself, even if it be the cause of serious evils to him, is his duty, and, all considered, is the best he can do. ...There is only one means of freeing ourselves from the difficulties indicated, and that is to render our knowledge of the rules explicit, complete, rationally connected and ordered, i.e. to reduce the chaotic aggregate of rules to a system, to make a science of it—Moral Science."