Don't be fooled by the gaudy cover -- this tiny book (44 pages) is a little classic of the genre. To be a successful trader requires self-knowledge above all. The world is what it is; trends trend as they trend. The same is given to all. What differentiates one trader from another is that the successful trader, like Machiavelli's Prince, knows how to read reality as it is given. Being bold when boldness is required, timid when timidity is best.... Thus, the best books on trading often end up being books on self-analysis.
One of the best books on trading I have ever read is this one: http://www.goodreads.com/book/show/253516.Trading_in_the_Zone_Master_the_Market_with_Confidence_Discipline_and_a_Winning_Attitude)
which, despite it's title, deals almost entirely with epistemological issues.
Strange, but true...