An Exact Exposition of the Orthodox Faith (Koinē Greek: Ἔκδοσις Ἀκριβὴς τῆς Ὀρθοδόξου Πίστεως, Ékdosis akribès tēs Orthodóxou Písteōs) – a summary of the teachings and dogmatic writings of the Early Church Fathers. More specifically the Cappadocian Fathers (Saint Basil, Saint Gregory of Nazianzus and Saint Gregory of Nyssa) from the 4th century. It incorporates Aristotelian language and demonstrates originality through John's selection of texts and annotations influenced by Antiochene analytical theology. This work, when translated into Oriental languages and Latin, became a valuable resource for both Eastern and Western thinkers, offering logical and theological concepts. Additionally, its systematic style served as a model for subsequent theological syntheses composed by medieval Scholastics. The "Exposition" delves into speculations about the nature and existence of God, giving rise to points of debate among later theologians.This writing was the first work of systematic theology in Eastern Christianity and an important influence on later Scholastic works