Jean-Jacques Rousseau, The Social Contract, 1762
http://www.constitution.org/jjr/socon_02.htmIt should be seen from the foregoing that what makes the will general is less the number of voters than the common interest uniting them; for, under this system, each necessarily submits to the conditions he imposes on others: and this admirable agreement between interest and justice gives to the common deliberations an equitable character which at once vanishes when any particular question is discussed, in the absence of a common interest to unite and identify the ruling of the judge with that of the party.
From whatever side we approach our principle, we reach the same conclusion, that the social compact sets up among the citizens an equality of such a kind, that they all bind themselves to observe the same conditions and should therefore all enjoy the same rights. Thus, from the very nature of the compact, every act of Sovereignty, i.e., every authentic act of the general will, binds or favours all the citizens equally; so that the Sovereign recognises only the body of the nation, and draws no distinctions between those of whom it is made up. What, then, strictly speaking, is an act of Sovereignty? It is not a convention between a superior and an inferior, but a convention between the body and each of its members. It is legitimate, because based on the social contract, and equitable, because common to all; useful, because it can have no other object than the general good, and stable, because guaranteed by the public force and the supreme power. So long as the subjects have to submit only to conventions of this sort, they obey no-one but their own will; and to ask how far the respective rights of the Sovereign and the citizens extend, is to ask up to what point the latter can enter into undertakings with themselves, each with all, and all with each.