Leviathan

For the laws of nature, as justice, equity, modesty, mercy, and, in sum, going to others as we would be done to, of themselves, without the terror of some power to cause them to be observed, are contrary to our natural passions, that carry us to partiality, pride, revenge, and the like. And covenants, without the sword, are but words and of no strength to secure a man at all.

A Commonwealth is said to be instituted, when a multitude of men do agree, and covenant, every one with every one, that to whatsoever man, or assembly of men, shall be given by the major part the right to present the person of them all, that is to say, to be their representative; every one, as well he that voted for it, as he that voted against it, shall authorise all the actions and judgements of that man, or assembly of men, in the same manner as if they were his own, to the end to live peaceably amongst themselves, and be protected against other men.

For all men are by nature provided of notable multiplying glasses (that is their passions and self-love) through which every little payment appeareth a great grievance, but are destitute of those prospective glasses (namely moral and civil science) to see afar off the miseries that hang over them, and cannot without such payments be avoided.

There be other names of government in the histories and books of policy; as tyranny and oligarchy; but they are not the names of other forms of government, but of the same forms misliked. For they that are discontented under monarchy call it tyranny; and they that are displeased with aristocracy call it oligarchy: so also, they which find themselves grieved under a democracy call it anarchy[.]

Of all these forms of government, the matter being mortal, so that not only monarchs, but also whole assemblies die, it is necessary for the conservation of the peace of men that as there was order taken for an artificial man, so there be order also taken for an artificial eternity of life; without which men that are governed by an assembly should return into the condition of war in every age; and they that are governed by one man, as soon as their governor dieth. This artificial eternity is that which men call the right of succession.