Augustine of Hippo completely baffled Louis Berkhof. If you read his 'The History of Christian Doctrines' you can sense his frustration with the 5th century African theologian. Augustine has been called the father of both Medieval Catholicism and the Protestant Reformation. There is a sense of course in which this is true. For with him you have both the seeds of sacerdotalism and of a Grace based system of Justification by Faith grounded in Divine Election. How can they be reconciled? Berkhof, a creature of post-Enlightenment rationalism could not, but for Augustine there was no conflict.