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As noted above, Cyril was a scholarly archbishop and a prolific writer. In the early years of his active life in the Church he wrote several exegeses. Among these were: ''Commentaries on the [[Old Testament]]'', ''Thesaurus'', ''Discourse Against [[Arianism|Arians]]'', ''Commentary on [[Gospel of John|St. John's Gospel]]'', and ''Dialogues on the [[Trinity]]''. In 429 as the Christological controversies increased, his output of writings was that which his opponents could not match. His writings and his theology have remained central to tradition of the Fathers and to all Orthodox even up today.