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Tranquillitas ordinis

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The Augustinian tradition

Augustine of Hippo defines the term "Tranquillitas Ordinis" in Book 19 of the City of God as "the peace of all things" or "well-ordered concord". Augustine links peace with his meaning of order, in which all things in the universe have their proper place established by God, their creator. Peace is therefore the state a person or thing achieves when it is in accordance with the larger created order. In Book 19, Augustine describes the supreme good and discusses efforts people take in order to reach happiness on earth. While Augustine denies the possibility of achieving tranquillitas ordinis on earth, he notes that aspects of the peace and happiness of heaven may still be found. Centuries later, Thomas Aquinas continued the tradition of true peace as tranquillitas ordinis in his Summa Theologica. Aquinas built upon the work of Augustine and formalized a theory of just war in which the Augustinian root idea of peace as tranquillitas ordinis is linked to the just war tradition. In the Summa Theologica, Aquinas describes the theory of just war as comprising a jus ad bellum and jus in bello. Jus ad bellum articulates the circumstances under which war may be pursued, while jus in bello describes correct conduct in war.

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