Book 1, Chapter 5: That We Must Always Go Back to a First Convention explained simply

CHAPTER V THAT WE MUST ALWAYS GO BACK TO A FIRST CONVENTION Even if I granted all that I have been refuting, the friends of despotism would be no better off. There will always be a great difference between subduing a multitude and ruling a society. Even if scattered individuals were successively enslaved by one man, however numerous they might be, I still see no more than a master and his slaves, and certainly not a people and its ruler; I see what may be termed an aggregation, but not an association; there is as yet neither public good nor body politic. The man in question, even if he has enslaved half the world, is still only an individual; his interest, apart from that of others, is still a purely private interest. If this same man comes to die, his empire, after him, remains scattered and without unity, as an oak falls and dissolves into a heap of ashes when the fire has consumed it. A people, says Grotius, can give itself to a king. Then, according to Grotius, a people is a people before it gives itself. The gift is itself a civil act, and implies public deliberation. It would be better, before examining the act by which a people gives itself to a king, to examine that by which it has become a people; for this act, being necessarily prior to the other, is the true foundation of society. Indeed, if there were no prior convention, where, unless the election were unanimous, would be the obligation on the minority to submit to the choice of the majority? How have a hundred men who wish for a master the right to vote on behalf of ten who do not? The law of majority voting is itself something established by convention, and presupposes unanimity, on one occasion at least.