Although the functions of the father of a family and those of the chief magistrate ought to make for the same object, they must do so in such different ways, and their duty and rights are so essentially distinct, that we cannot confound them without forming very false ideas about the fundamental laws of society, and falling into errors which are fatal to mankind. In fact, if the voice of nature is the best counsellor to which a father can listen in the discharge of his duty, for the Magistrate it is a false guide, which continually prevents him from performing his, and leads him on sooner or later to the ruin of himself and of the State, if he is not restrained by the most sublime virtue. The only precaution necessary for the father of a family is to guard himself against depravity, and prevent his natural inclinations from being corrupted; whereas it is these themselves which corrupt the Magistrate. In order to act aright, the first has only to consult his heart; the other becomes a traitor the moment he listens to his. Even his own reason should be suspect to him, nor should he follow any rule other than the public reason, which is the law. Thus nature has made a multitude of good fathers of families; but it is doubtful whether, from the very beginning of the world, human wisdom has made ten men capable of governing their peers. From all that has just been said, it follows that _public_ economy, which is my subject, has been rightly distinguished from _private_ economy, and that, the State having nothing in common with the family except the obligations which their heads lie under of making both of them happy, the same rules of conduct cannot apply to both. I have considered these few lines enough to overthrow the detestable system which Sir Robert Filmer has endeavoured to establish in his _Patriarcha_; a work to which two celebrated writers have done too much honour in writing books to refute it. Moreover, this error is of very long standing; for Aristotle himself thought proper to combat it with arguments which may be found in the first book of his _Politics_. I must here ask my readers to distinguish also between _public economy_, which is my subject and which I call _government_, and the supreme authority, which I call _Sovereignty_; a distinction which consists in the fact that the latter has the right of legislation, and in certain cases binds the body of the nation itself, while the former has only the right of execution, and is binding only on individuals. I shall take the liberty of making use of a very common, and in some respects inaccurate, comparison, which will serve to illustrate my meaning.