Thomas Aquinas

===Just war===
{{See also|Just War}}

While it would be contradictory to speak of a "just schism", a "just brawling" or a "just sedition", the word "war" permits sub-classification into good and bad kinds. Thomas Aquinas, centuries after [[Augustine of Hippo]], used the authority of Augustine's arguments in an attempt to define the conditions under which a war could be just.<ref>{{Cite web |title=The Just War |url=http://www.catholiceducation.org/articles/politics/pg0029.html |url-status=live |archive-url=https://web.archive.org/web/20210423100800/https://www.catholiceducation.org/articles/politics/pg0029.html |archive-date=23 April 2021 |access-date=24 February 2012}}</ref> He laid these out in his work ''[[Summa Theologica]]'':
* First, war must occur for a good and just purpose rather than the pursuit of wealth or power.
* Second, just war must be waged by a properly instituted authority such as the state.
* Third, peace must be a central motive even in the midst of violence.<ref>{{Cite book |last=Gonzalez |first=Justo L. |url=https://archive.org/details/storyofchristian01gonz |title=The Story of Christianity |publisher=HarperSanFrancisco |year=1984 |url-access=registration}}</ref>