For me Musashi is the archetypal enlightened martial artist - undefeated, master swordsman who used his way of the sword(s) to find a spiritual path of enlightenment. His book of 5 Rings is evidence of the great spiritual insights he achieved and how his two sword art was more than just a killing art.
i thought Musashi was a psychopath who was hellbent on winning. lets face it, if this was the modern day, he would be in solitary confinement until the end of his day. he didn't take up other stuffs until he couldn't find a worthy opponent; in another word, he was bored out of his skull so he took up other stuffs to keep himself occupied.