The Book of Five Rings
The Book of Five Rings by Miyamoto Musashi
Many have wondered how a primer on martial arts strategy written by a sword samurai can apply to other areas of life. But the successful man, using creative interpretation, will know that observing an opponent's moves, confusing him and noting his vulnerabilities are as valid in business as in karate. Musashi outlines psychological tactics to throw competitors off guard, including the crucial suki, that brief moment of vulnerable hesitation that presents the best time to strike.
What it teaches us: Musashi argues that it is not important how an opponent is cut, but that he is cut, period. In other words, focus not on the details, but on the main goal. It's equally important to use all one's resources, to take advantage of your opponent's fears and to make strategy your everyday attitude. Be open to change, be unpredictable and never take extreme positions.
Quote: "When in a fight to the death, one wants to employ all one's weapons to the utmost. I must say that to die with one's sword still sheathed is most regrettable."