To stay alive in the days of the samurai, it was better to avoid the superfluous and focus on the essential: the win. In saber, decorative reels pay little. So well written that one quickly realizes that the sword fighting, first pretext of the book, is just one example: parallels are numerous with everyday life. The principles proposed to lead a righteous life on "The True Way" has not aged a bit. Businessmen such are increasingly fond of such axes to follow. Divided into chapters (Earth, Water, Fire, Wind, empty) is intended to be educational: have as master one of the greatest samurai of all time.