This is an excellent resource: “The Reformation: Roots and Ramifications” by Heiko Oberman. I just finished reading the chapter that covered mysticism in the medieval church; it was quite helpful. It’s too detailed to summarize in one blog post, so for now I’ll just quote a section where Oberman summarized Augustine’s view of love. This is worth thinking about – especially the two different “orbits”.
[Augustine was] a theologian of love. Not only is his great survey of history in ‘De civitate Dei’ (The City of God) shot through with the theme of love, but his ‘Confessiones’ (Confessions) take from the love of God and from God’s love a new definition of the person. Reason and intellect do not place us in the cosmic hierarchy, contrary to what Augustine had learned while studying philosophy, but love. Love is ‘pondus’ (weight), and ‘pondus’ is not a burden but rather gravity, and therefore determines the orbit into which a human being gravitates.
Augustine assumes that there are only two sorts of people, who move in two different orbits. One sort rotates around themselves, the other sort, around God. Both orbits are determined by the love that seeks the center, either by amor sui, self-love, or by amor Dei, the love of God. In order to make the jump from the ‘self-centered’ orbit to the other one, human beings need the help of a sovereign act of God. God alone makes this jump from the old to the new orbit happen—by his grace alone, ‘sola gratia.’
Heiko Augustinus Oberman, The Reformation : Roots and Ramifications (London; New York: T&T Clark, 2004), 82–83.
(A paperback copy of this book is available on Amazon.)