Check out these classics of Early Christian literature: On the Incarnation of the Word by St. Athanasius as well as On the Incarnation of the Lord by St. John Cassian, and four books by G.K. Chesterton: Eugenics and Other Evils, Unabridged, The Everlasting Man, Orthodoxy, and Heretics. Also, get 4 free e-books by C.S. Lewis, and many more! You can download them or read them online for free. Use the top menu or scroll down on that page to find these books.
Also, read the description of St. Augustine's doctrine of predestination and his little-known recantation of that doctrine in The City of God, Volume II toward the end of his life. See also The Conferences by St. John Cassian, which rebuts the arguments that St. Augustine put forth on predestination and total depravity.
Get The Rule of St. Benedict - especially if you're interested in Rod Dreher's book The Benedict Option that attempts to apply St. Benedict's general principles to Christians striving to lead a life of spiritual discipline in today's post-Christian world, and The Ladder of Divine Ascent by St. John Climacus. Lots of other good literature too!
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