I think positively. I’m sure 100% :) And it’s true, because 80% of what a person is that what that person thinks about itself itself :p
But anyway, I’m planning to read this book one day… When I have a time! And now I will forget about it because I learned to keep in mind only one problem at a time. This is the one of the most important stones of my time management
Here is a link to a publicly shared PDF for free download or online reading.