Here are some quick places to familiarize yourself with this outlook and its importance in the thought of the West:
If you want to explore further the controversy between Augustine and Pelagius -- crucial to the defining of orthodoxy thenceforth within Christianity -- a good place to go is the page on Pelagius and Pelagianism at EarlyChurch.org (a UK site).
R. Scott Clark, "Pelagianism" -- "notes . . . originally written for a course in theological anthropology given at Wheaton College, Spring Semester, 1997." Clark is Associate Professor of Historical and Systematic Theology at Westminster Theological Seminary in California.
With special reference to the history of the early English church, see "Pelagianism" at the an interesting site devoted to the history and culture of Anglo-Saxon England.