Root is at least a thousand times smarter than the average person. He is clearly well-read, articulate, and intelligent. At parts, it seems that Root may stumble over his own intelligence in this book.
His thesis is clear enough and captured well in the subtitle: "sharing in Christ by sharing ourselves". He sticks with the agenda and is frequently borderline redundant in his efforts to summarize.
When I say that Root may "stumble" over his intelligence here's what I mean: The language in this book seems primarily philosophical rather than biblical. I feel that Root draws more from neuroscience, history, and philosophy than from Scripture. While appreciate what these fields add to the conversation, the biblical engagement on this topic seemed a little half baked.
I recommended the book to someone when I was about halfway through. I now feel slightly embarrassed and may go back and say, "Yeah, just read the first half..."