The essential idea - there is no 'you' or 'I', there is only 'this'. Or to put it another way, "this is all there is". If you understand this, then you do not need this book. If you do not, then this book will probably not help as it simply repeats this message over in different ways. Quite a conundrum isn't it? It also doesn't help resolve the various inconsistencies inherent in this teaching style, such as who wrote the book. Answer: no-one did. Or 'life' did. Again, while this is true, if you don't get it it really isn't that helpful. Various words are used such as 'appearance' or 'apparently' but the meaning of the words is not explained. This can lead to various interpretations and further confusion for the seeker.
My impression is that this kind of face-to-face teaching may be helpful for a very few who are 'ripe', but it doesn't work well as a book and there are much better alternative teachings that are less confusing.