Nicene Creed

=== Filioque controversy ===
{{Main article|Filioque}}
In the late 6th century, some Latin-speaking churches added the word {{lang|la|Filioque}} ("and the Son") to the description of the procession of the Holy Spirit, in what many Eastern Orthodox Christians have at a later stage argued is a violation of Canon VII<ref>{{Cite web |url=http://www.ccel.org/ccel/schaff/npnf214.x.xvi.x.html |title=Canon VII |access-date=29 November 2006 |archive-date=18 October 2012 |archive-url=https://web.archive.org/web/20121018095736/http://www.ccel.org/ccel/schaff/npnf214.x.xvi.x.html |url-status=live }}</ref> of the [[Council of Ephesus|Third Ecumenical Council]], since the words were not included in the text by either the [[First Council of Nicaea|Council of Nicaea]] or [[First Council of Constantinople|that of Constantinople.]]<ref>For a different view, see e.g. [http://www.ccel.org/ccel/schaff/npnf214.x.xvi.xi.html Excursus on the Words πίστιν ἑτέραν] {{Webarchive|url=https://web.archive.org/web/20150721224314/http://www.ccel.org/ccel/schaff/npnf214.x.xvi.xi.html |date=21 July 2015 }}</ref> This was incorporated into the liturgical practice of Rome in 1014.<ref name="Catholic Greek-Latin" /> {{lang|la|Filioque}} eventually became one of the main causes for the [[East-West Schism]] in 1054, and the failures of the repeated union attempts.