Best Book For Horse Trainers?

This is an easy question. I often see people arguing about which celebrity clinician they follow. Some people get nearly religious about it. They have found their training savior, and they try to warn others of the heretics out there who do not preach the true gospel of natural horsemanship. 

 Just about any person experienced in natural horsemanship can sufficiently teach the basic techniques of the art. Ray Hunt and Dorrence, to my eye, had the best ability to comprehend and explain the concepts that underlie natural horsemanship. I have learned from many great trainers over the years. However, for the people who have seen the techniques demonstrated countless times and have heard all of the concepts that are the underpinning of natural horsemanship, yet still find themselves disappointed in the results that they get with their horse, there is one writer that I would go to every time, Ryan Holiday.

 Specifically, his great work, "Stillness is The Key". 

 When one knows the techniques and the concepts and is tempted to blame the horse, that is the time to rush out and buy each book that Holiday has written. Of course, these books only mention horses in passing, if at all. They are not horse books. They are people books. That matters--it is very rare for the problem to be a horse problem and it is mind numbingly common for the problem to be a people problem. 

Holiday's scholarship forces the reader to confront one's own vast range of "people problems." Consider this from "Stillness is the Key": 

 "So much of the distress we feel comes from reacting instinctually instead of with conscientious deliberation. So much of what we get wrong comes from the same place. We are reacting to shadows. We are taking as certainties impressions we have yet to test. We're not stopping to put on our glasses and really look." 

 Yes, that is it. That is why you do not have your horse under control. You must first get yourself under control. You must control your emotions and instincts before you can expect a horse to abandon his instincts and put his life in your hands. 

 Ryan Holiday's works teach how to achieve that goal better than anything that I have ever come across.