The Art Spirit, By Robert Henri: Encouraging Quotes For Artists

Glad to see you are back on YT. Good last three videos. And for the book -- I see at least three authors that titled there book 'How to write this book ' On your book, I see written on the back page that it is useless.... a joke of course but what is it about your book that would make me buy it ?
Also thanks for the reference on ' the Art Spirit ' book.