The value of this book depends on how much faith you place in the Enneagram, an ancient method of categorizing personalities into nine different types.
The book is wonderfully well-written, but it suffers from two core problems. First, since we’re all one type (with maybe one additionally “wing”), then about 80% of the book won’t be that valuable to you. Second, once you know your personality type … then what? The book purports to give you some advice about how to handle yourself, but I found it to be very general.
I don’t regret reading it, and I’m not convinced there are any spiritual issues here (some people consider this a pseudo religion or mysticism). It’s pretty common-sensical stuff. It’s not terrible, and there are probably some people who would find it’s contents to be a revelation.
I just wasn’t one of them.