Burt, Donald. Augustine’s World: An Introduction to his Speculative Philosophy. Lanham: University Press of America, 1996.  

From the Publisher:

“This book examines Augustine’s description of the actually existing world, especially that aspect most important for the human pursuit of happiness: the human being and God. It begins with an overview of the characteristics of the human individual and the context in which they must live out their lives, a context dominated by two seemingly contradictory realities: the existence of God and the existence of evil. It follows with an in-depth examination of the human individual. Topics include the nature of the human (body and soul), the possibility and sources of knowledge, the process of knowledge (sensation, memory, intellect), free will and grace, human destiny, and human origins. A final chapter explores Augustine’s thought on the existence and nature of God. An appendix gives a brief description of two of the major controversies in Augustine’s life: Pelagianism and Semi-Pelagianism.”

Online:
Amazon