This is quite simply the best book that any guitarist could ever read: and that is regardless of their age, experience, style, talent or reason for playing guitar.
If you play guitar then you should read this book. If I was going to teach guitar, I would use this alongside any text I can think of and make the rule that if you cannot agree with the sentiments of this book then you should quit.
This book even has gems of quotable wisdom for players of every abailty and experience. Newcomers will get a solid foundation to build on (and will be put off if they are seeking to play for the wrong reasons), intermediate players will get help on how to deal with criticism, how to keep focussed on improvement, how to deal when you feel you've hit your limits etc - and en experineced player will be able to make sure they've kept true to themself, whilst ensuring that they have not strayed from the reasons they first picked up the instrument.
The book is filled with quotes and just enough inspiration to keep you going without it becoming over the top sickly, new age nonesense.
In my particular experience, this was like someone put into words my exact approach to playing guitar and the exact approachI had always wanted to take but didn't fully realise / could not put into words.
I have read this 5 times and continue to dip into it like a Bible. When I read it the third time, I read the final word of the final page and went immediately back to the start for my 4th time through - it is that good.
Plus, it's short, cheap and yet can have such a massive impact on your playing. Amazing for a book with no actual chords, music, TAB or transcriptions.
Plus each chapter starts with a quote from a legendary musician to help with the inspiration.