Kant's Principles of Politics, including his Essay on Perpetual Peace
Second Section which contains THE DEFINITIVE ARTICLES OF A PERPETUAL PEACE BETWEEN STATES.
Enlightenment Immanuel Kant EnglishA state of Peace among men who live side by side with each other, is not the natural state. The state of Nature is rather a state of War; for although it may not always present the outbreak of hostilities, it is nevertheless continually threatened with them. The state of Peace must, therefore, be established; for the mere cessation of hostilities furnishes no security against their recurrence, and where there is no guarantee of peace between neighbouring States—which can only be furnished under conditions that are regulated by Law—the one may treat the other, when proclamation is made to that effect, as an enemy.