Significant Discourses on Prayer in Church History Origen’s Treatise on Prayer (Περὶ εὐχῆς; Peri euchēs, usually cited by its Latin title, De oratione) is one of the first full treatments of prayer in church history.114 In this treatise Origen did a philological study of εὐχή, euchē, and προσευχή, proseuchē, discussed the moral prerequisites of effective prayer, that is, recollection of God, preparation of the mind, forgiveness of our enemies, and submissiveness to God; discussed the