A Essay Concerning the true original, extent, and end of Civil Government
by John Locke
I doubt not but this will seem a very strange doctrine to some men; but before they condemn it, I desire them to resolve me by what right any prince or state can put to death or punish an alien for any crime he commits in their country? It is certain their laws, by virtue of any sanction they receive from the promulgated will of the legislature, reach not a stranger. They speak not to him, nor, if they did, is he bound to hearken to them. The legislative authority by which they are in force over the subjects of that commonwealth hath no power over him. Those who have the supreme power of making laws in England, France, or Holland are, to an Indian, but like the rest of the world- men without authority. And therefore, if by the law of Nature every man hath not a power to punish offences against it, as he soberly judges the case to require, I see not how the magistrates of any community can punish an alien of another country, since, in reference to him, they can have no more power than what every man naturally may have over another.Besides the crime which consists in violating the laws, and varying from the right rule of reason, whereby a man so far becomes degenerate, and declares himself to quit the principles of human nature and to be a noxious creature, there is commonly injury done, and some person or other, some other man, receives damage by his transgression; in which case, he who hath received any damage has (besides the right of punishment common to him, with other men) a particular right to seek reparation from him that hath done it. And any other person who finds it just may also join with him that is injured, and assist him in recovering from the offender so much as may make satisfaction for the harm he hath suffered.
From these two distinct rights (the one of punishing the crime, for restraint and preventing the like offence, which right of punishing is in everybody, the other of taking reparation, which belongs only to the injured party) comes it to pass that the magistrate, who by being magistrate hath the common right of punishing put into his hands, can often, where the public good demands not the execution of the law, remit the punishment of criminal offences by his own authority, but yet cannot remit the satisfaction due to any private man for the damage he has received. That he who hath suffered the damage has a right to demand in his own name, and he alone can remit. The damnified person has this power of appropriating to himself the goods or service of the offender by right of self-preservation, as every man has a power to punish the crime to prevent its being committed again, by the right he has of preserving all mankind, and doing all reasonable things he can in order to that end. And thus it is that every man in the state of Nature has a power to kill a murderer, both to deter others from doing the like injury (which no reparation can compensate) by the example of the punishment that attends it from everybody, and also to secure men from the attempts of a criminal who, having renounced reason, the common rule and measure God hath given to mankind, hath, by the unjust violence and slaughter he hath committed upon one, declared war against all mankind, and therefore may be destroyed as a lion or a tiger, one of those wild savage beasts with whom men can have no society nor security. And upon this is grounded that great law of nature, "Whoso sheddeth man′s blood, by man shall his blood be shed." And Cain was so fully convinced that every one had a right to destroy such a criminal, that, after the murder of his brother, he cries out, "Every one that findeth me shall slay me," so plain was it writ in the hearts of all mankind.
By the same reason may a man in the state of Nature punish the lesser breaches of that law, it will, perhaps, be demanded, with death? I answer: Each transgression may be punished to that degree, and with so much severity, as will suffice to make it an ill bargain to the offender, give him cause to repent, and terrify others from doing the like. Every offence that can be committed in the state of Nature may, in the state of Nature, be also punished equally, and as far forth, as it may, in a commonwealth. For though it would be beside my present purpose to enter here into the particulars of the law of Nature, or its measures of punishment, yet it is certain there is such a law, and that too as intelligible and plain to a rational creature and a studier of that law as the positive laws of commonwealths, nay, possibly plainer; as much as reason is easier to be understood than the fancies and intricate contrivances of men, following contrary and hidden interests put into words; for truly so are a great part of the municipal laws of countries, which are only so far right as they are founded on the law of Nature, by which they are to be regulated and interpreted.