The body politic, taken individually, may be considered as an organised, living body, resembling that of man. The sovereign power represents the head; the laws and customs are the brain, the source of the nerves and seat of the understanding, will and senses, of which the Judges and Magistrates are the organs: commerce, industry, and agriculture are the mouth and stomach which prepare the common subsistence; the public income is the blood, which a prudent _economy_, in performing the functions of the heart, causes to distribute through the whole body nutriment and life: the citizens are the body and the members, which make the machine live, move and work; and no part of this machine can be damaged without the painful impression being at once conveyed to the brain, if the animal is in a state of health. The life of both bodies is the self common to the whole, the reciprocal sensibility and internal correspondence of all the parts. Where this communication ceases, where the formal unity disappears, and the contiguous parts belong to one another only by juxtaposition, the man is dead, or the State is dissolved. The body politic, therefore, is also a moral being possessed of a will; and this general will, which tends always to the preservation and welfare of the whole and of every part, and is the source of the laws, constitutes for all the members of the State, in their relations to one another and to it, the rule of what is just or unjust: a truth which shows, by the way, how idly some writers have treated as theft the subtlety prescribed to children at Sparta for obtaining their frugal repasts, as if everything ordained by the law were not lawful. It is important to observe that this rule of justice, though certain with regard to all citizens, may be defective with regard to foreigners. The reason is clear. The will of the State, though general in relation to its own members, is no longer so in relation to other States and their members, but becomes, for them, a particular and individual will, which has its rule of justice in the law of nature. This, however, enters equally into the principle here laid down; for in such a case, the great city of the world becomes the body politic, whose general will is always the law of nature, and of which the different States and peoples are individual members. From these distinctions, applied to each political society and its members, are derived the most certain and universal rules, by which we can judge whether a government is good or bad, and in general of the morality of all human actions.