A Essay Concerning the true original, extent, and end of Civil Government
by John Locke
But though this be a state of liberty, yet it is not a state of licence; though man in that state have an uncontrollable liberty to dispose of his person or possessions, yet he has not liberty to destroy himself, or so much as any creature in his possession, but where some nobler use than its bare preservation calls for it. The state of Nature has a law of Nature to govern it, which obliges every one, and reason, which is that law, teaches all mankind who will but consult it, that being all equal and independent, no one ought to harm another in his life, health, liberty or possessions; for men being all the workmanship of one omnipotent and infinitely wise Maker; all the servants of one sovereign Master, sent into the world by His order and about His business; they are His property, whose workmanship they are made to last during His, not one another′s pleasure. And, being furnished with like faculties, sharing all in one community of Nature, there cannot be supposed any such subordination among us that may authorise us to destroy one another, as if we were made for one another′s uses, as the inferior ranks of creatures are for ours. Every one as he is bound to preserve himself, and not to quit his station wilfully, so by the like reason, when his own preservation comes not in competition, ought he as much as he can to preserve the rest of mankind, and not unless it be to do justice on an offender, take away or impair the life, or what tends to the preservation of the life, the liberty, health, limb, or goods of another.
And that all men may be restrained from invading others′ rights, and from doing hurt to one another, and the law of Nature be observed, which willeth the peace and preservation of all mankind, the execution of the law of Nature is in that state put into every man′s hands, whereby every one has a right to punish the transgressors of that law to such a degree as may hinder its violation. For the law of Nature would, as all other laws that concern men in this world, be in vain if there were nobody that in the state of Nature had a power to execute that law, and thereby preserve the innocent and restrain offenders; and if any one in the state of Nature may punish another for any evil he has done, every one may do so. For in that state of perfect equality, where naturally there is no superiority or jurisdiction of one over another, what any may do in prosecution of that law, every one must needs have a right to do.
And thus, in the state of Nature, one man comes by a power over another, but yet no absolute or arbitrary power to use a criminal, when he has got him in his hands, according to the passionate heats or boundless extravagancy of his own will, but only to retribute to him so far as calm reason and conscience dictate, what is proportionate to his transgression, which is so much as may serve for reparation and restraint. For these two are the only reasons why one man may lawfully do harm to another, which is that we call punishment. In transgressing the law of Nature, the offender declares himself to live by another rule than that of reason and common equity, which is that measure God has set to the actions of men for their mutual security, and so he becomes dangerous to mankind; the tie which is to secure them from injury and violence being slighted and broken by him, which being a trespass against the whole species, and the peace and safety of it, provided for by the law of Nature, every man upon this score, by the right he hath to preserve mankind in general, may restrain, or where it is necessary, destroy things noxious to them, and so may bring such evil on any one who hath transgressed that law, as may make him repent the doing of it, and thereby deter him, and, by his example, others from doing the like mischief. And in this case, and upon this ground, every man hath a right to punish the offender, and be executioner of the law of Nature.