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6.---"No state at war with another shall countenance such modes of hostility as would make mutual confidence impossible in a subsequent state of peace: such are the employment of assassins (percussores) or of poisoners (venefici), breaches of capitulation, the instigating and making use of treachery (perduellio) in the hostile state."
These are dishonourable stratagems. For some kind of confidence in the disposition of the enemy must exist even in the midst of war, as otherwise peace could not be concluded, and the hostilities would pass into a war of extermination (bellum internecinum). War, however, is only our wretched expedient of asserting a right by force, an expedient adopted in the state of nature, where no court of justice exists which could settle the matter in dispute. In circumstances like these, neither of the two parties can be called an unjust enemy, because this form of speech presupposes a legal decision: the issue of the conflict---just as in the[p. 115] case of the so-called judgments of God---decides on which side right is. Between states, however, no punitive war (bellum punitivum) is thinkable, because between them a relation of superior and inferior does not exist. Whence it follows that a war of extermination, where the process of annihilation would strike both parties at once and all right as well, would bring about perpetual peace only in the great graveyard of the human race. Such a war then, and therefore also the use of all means which lead to it, must be absolutely forbidden. That the methods just mentioned do inevitably lead to this result is obvious from the fact that these infernal arts, already vile in themselves, on coming into use, are not long confined to the sphere of war. Take, for example, the use of spies (uti exploratoribus). Here only the dishonesty of others is made use of; but vices such as these, when once encouraged, cannot in the nature of things be stamped out and would be carried over into the state of peace, where their presence would be utterly destructive to the purpose of that state.
Although the laws stated are, objectively regarded, (i.e. in so far as they affect the action of rulers) purely prohibitive laws (leges prohibitiv), some of them (leges strict) are strictly valid without regard to circumstances and urgently require to be enforced. Such are Nos. 1, 5, 6. Others, again, (like Nos. 2,[p. 116] 3, 4) although not indeed exceptions to the maxims of law, yet in respect of the practical application of these maxims allow subjectively of a certain latitude to suit particular circumstances. The enforcement of these leges lat may be legitimately put off, so long as we do not lose sight of the ends at which they aim. This purpose of reform does not permit of the deferment of an act of restitution (as, for example, the restoration to certain states of freedom of which they have been deprived in the manner described in article 2) to an infinitely distant date---as Augustus used to say, to the "Greek Kalends", a day that will never come. This would be to sanction non-restitution. Delay is permitted only with the intention that restitution should not be made too precipitately and so defeat the purpose we have in view. For the prohibition refers here only to the mode of acquisition which is to be no longer valid, and not to the fact of possession which, although indeed it has not the necessary title of right, yet at the time of so-called acquisition was held legal by all states, in accordance with the public opinion of the time.[115]
CONTAINING THE DEFINITIVE ARTICLES OF A PERPETUAL PEACE BETWEEN STATES
A state of peace among men who live side by side is not the natural state (status naturalis), which[p. 118] is rather to be described as a state of war:[116] that is to say, although there is not perhaps always actual open hostility, yet there is a constant threatening that an outbreak may occur. Thus the state of peace must be established.[117] For the mere[p. 119] cessation of hostilities is no guarantee of continued peaceful relations, and unless this guarantee is given by every individual to his neighbour---which can only be done in a state of society regulated by law---one man is at liberty to challenge another and treat him as an enemy.[118]
[p. 120]FIRST DEFINITIVE ARTICLE OF PERPETUAL PEACE
I.---"The civil constitution of each state shall be republican."
The only constitution which has its origin in the idea of the original contract, upon which the lawful legislation of every nation must be based, is the republican.[119] It is a constitution, in the first place,[p. 121] founded in accordance with the principle of the freedom of the members of society as human beings: secondly, in accordance with the principle of the dependence of all, as subjects, on a common legislation: and, thirdly, in accordance with the law of the equality of the members as citizens. It is then, looking at the question of right, the only constitution whose fundamental principles lie at the basis of every form of civil constitution. And the only question for us now is, whether it is also the one constitution which can lead to perpetual peace.
Now the republican constitution apart from the soundness of its origin, since it arose from the[p. 122] pure source of the concept of right, has also the prospect of attaining the desired result, namely, perpetual peace. And the reason is this. If, as must be so under this constitution, the consent of the subjects is required to determine whether there shall be war or not, nothing is more natural than that they should weigh the matter well, before undertaking such a bad business. For in decreeing war, they would of necessity be resolving to bring down the miseries of war upon their country. This implies: they must fight themselves; they must hand over the costs of the war out of their own[p. 123] property; they must do their poor best to make good the devastation which it leaves behind; and finally, as a crowning ill, they have to accept a burden of debt which will embitter even peace itself, and which they can never pay off on account of the new wars which are always impending. On the other hand, in a government where the subject is not a citizen holding a vote, (i.e. in a constitution which is not republican), the plunging into war is the least serious thing in the world. For the ruler is not a citizen, but the owner of the state, and does not lose a whit by the war, while he goes on enjoying the delights of his table or sport, or of his pleasure palaces and gala days. He can therefore decide on war for the most trifling reasons, as if it were a kind of pleasure party.[120] Any justification of it that is necessary for the sake of decency he can leave without concern to the diplomatic corps who are always only too ready with their services.
[p. 124]* * *
