This was reccomended to me, though I have not had a chance to read it all, it seems interesting.

In Spiritual Theology Father Jordan Aumann dispels the common misconception that ascetical and mystical theology is for the select few. He reminds us that "the real purpose of the study of the spiritual life is not to produce scholars but to form holy Christians."

http://www.op.org/domcentral/study/aumann/st/default.htm