I've been listening to Augustine's Confessions while doing yard work and exercising. It's been 8-9 years since I read the book and was blown away. The entire book is written as a prayer to God. Listening to it is a different experience.
It's listening to Augustine pray. And listening to him confess his sins, struggles, and intellectual wrestlings in this spiritual autobiography reminds me just how similar we are to our ancient brothers and sisters. As he talks to his Savior I hear what a heart in love with Jesus sounds like. And to listen to him ponder the miracle that is the human memory gives me a glimpse into the brilliant mind this man had.
For what it's worth, I think this audio book is a soul-enriching investment