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On Cleaving to God (Albert the Great)
Of the Manichaeans (Alexander of Lycopolis)
Outlines of Moral Science. (Archibald Alexander)
One-Year Bible Reading Calendar
Orthodox Russian-Language Classics (Russian)
Other Russian-Language Classics (Russian)
On the Incarnation of the Word (St. Athanasius)
On Christian Doctrine, in Four Books (St. Augustine) (classic)
On Loving God (St. Bernard of Clairvaux) (classic)
Oratory of the Faithful Soul; or, Devotions to the Most Holy Sacrament, and to Our Blessed Lady. (Louis of Blois [Ludovicus Blosius])
Of Prayer—A Perpetual Exercise of Faith. The Daily Benefits Derived from It. (John Calvin) (classic)
On the Christian Life (John Calvin)
Orthodoxy (Gilbert Keith Chesterton) (classic)
Octavius of Minucius Felix (felix)
Our Man In Heaven: An Exposition of the Epistle to the Hebrews (Edward Fudge)
Origin of the New Testament (Adolf Harnack)
On the Resurrection, Fragments (justin_martyr) (classic)
On the Sole Government of God (justin_martyr) (classic)
Other Fragments from the Lost Writings of Justin (justin_martyr) (classic)
Of Justification by Faith and Works (William Law) (classic)
Of the Manner in Which the Persecutors Died (Lactantius)
On the Workmanship of God, or the Formation of Man (Lactantius)
Open Letter on Translating (Martin Luther)
Oration Concerning Simeon and Anna On the Day that They Met in the Temple and Other Fragments (Methodius of Olympus)
On the Jewish Meats (Novatian)
Origen Against Celsus (Origen)
Origen on Prayer (Origen) (classic)
Origen's Commentary on the Gospel of Matthew (Origen)
Of Communion with God the Father, Son and Holy Ghost (John Owen) (classic)
Of Schism (John Owen) (classic)
Of Temptation (John Owen) (classic)
Of the Mortification of Sin in Believers (John Owen) (classic)
On the Government of God: A Treatise Wherein Are Shown by Argument and by Examples Drawn from the Abandoned Society of the Times the Ways of God To (Salvian)
On Religion: Speeches to Its Cultured Despisers (Friedrich Schleiermacher)
Old Testament Types and Teachings (Hannah Whitall Smith)
On Exhortation to Chastity (Tertullian)
On the Apparel of Women (Tertullian)
On the Flesh of Christ (Tertullian)
On the Resurrection of the Flesh (Tertullian)
On the Veiling of Virgins (Tertullian)
Of God and His Creatures (St. Thomas Aquinas) (classic)
Origin of the Four Gospels (Constantin von Tischendorf)
Our Translated Gospels (Charles Cutler Torrey)
Our Daily Homily (F. B. Meyer) (classic)
Our Daily Homily (F. B. Meyer)
Old Testament in Greek According to the Septuagint, Vol. I: Genesis--IV Kings (H. B. Swete)
Old Testament in Greek According to the Septuagint, Vol. II: I Chronicles--Tobit (H. B. Swete)
Old Testament in Greek According to the Septuagint, Vol. III: Hosea--4 Maccabees (H. B. Swete)
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