This is an excellent discussion of non-duality, starting from first principles and using logic. It is extremely clear and very interesting. (Also loved the book by Richard Sylvester with its 'ominous' title, "I hope you die soon". He says this was a blessing given him by Tony Parsons, and the death of the self did occur.) ---- One issue I have with the strict 'non-duality' approach is that if you make the error of taking it literally, i.e. concluding that 'there is nothing to do,' because 'there is no one' to choose one way or the other, then you can end up bereft. Not sure what Hartong says about that, will have to check and then edit this review again.