Therefore, the Feast of Orthodoxy is like a stamp that seals and confirms the dogmatic activity of the Church of Christ as Orthodox, in her struggle against heresy. It was, furthermore, during the epoch that led up to this feast that St. John of Damascus wrote a famous treatise, in which he systematically presents the doctrine of the Church, expressed in her struggle against heresy during the age of the Œcumenical Synods and as it was clarified by the Holy Fathers. He has rightly called this major treatise of his “A Precise Exposition of the Orthodox Faith (tes orthodoxou pisteos).” [²⁰]