I actually found Walden before anything related to early retirement on the internet, totally changed my life. I decided then and there to figure out how to find passive income and retire. I'd recommend reading the book too, rather than just listening, I need to read slow to really think deeply about it. So many good thoughts in that book, from the farmers who get owned by their farms, to the comparison of how long it took natives to build their homes, to that lamp post bit near the end.
Where are you and where are you going?