As I embarked on my Very Long Walk Through Spain, one of my important packing decisions involved what books to bring. Fellow voracious readers will understand the complexity of that decision! Fortunately, we now live in an era where space/weight is not an issue. Thank you, God, for whoever it was who invented e-books! The issue becomes more of substance.

A long and weighty walk perhaps needed a long and weighty book? But did I want to get bogged down with ideas or wrestle with deep theological o...