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Respectfully Quoted: A Dictionary of Quotations. 1989.

NUMBER: 1909
AUTHOR: Saint Thomas Aquinas (1225–74)
QUOTATION: In order for a war to be just, three things are necessary. First, the authority of the sovereign…. Secondly, a just cause…. Thirdly … a rightful intention.
ATTRIBUTION: ST. THOMAS AQUINAS, Summa Theologica, part II–II, question 40, article 1, pp. 1359–60 (1947). Written 1266–1273.

The three conditions are sometimes paraphrased as: public authority, just cause, right motive.