Front Page Titles (by Subject) QUESTION XLII.: OF SEDITION. - Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1)
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QUESTION XLII.: OF SEDITION. - St. Thomas Aquinas, Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1) 
Aquinas Ethicus: or, the Moral Teaching of St. Thomas. A Translation of the Principal Portions of the Second part of the Summa Theologica, with Notes by Joseph Rickaby, S.J. (London: Burns and Oates, 1892).
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Article II.—Is sedition always a mortal sin?
R. Sedition is opposed to the unity of a multitude, that is, of a people, city, or kingdom. The unity to which sedition is opposed is a unity of law and public utility. Therefore sedition is a mortal sin of its kind, and all the more grievous inasmuch as the public good that is assailed by sedition is greater than private good that suffers in assault and battery. The sin of sedition attaches primarily and principally to those who bring about the sedition, and they sin most grievously; secondarily, to those who abet them in disturbing the common weal. But they who defend the common weal, and resist disturbers of the public peace, are not to be called seditious: as neither are they who defend their own persons said to be guilty of assault.