An interesting story about Musashi, and what may have influenced some of what he wrote prior to his death, was his encounter with the monk Takuan. Musashi saw a

An interesting story about Musashi, and what may have influenced some of what he wrote prior to his death, was his encounter with the monk Takuan. Musashi saw a snake approaching the monk in mediation, and witnessed the snake simply crawl over Takuan without any fear. But as the snake approached Musashi, it recoiled to strike, then ran away. Musashi was grieved because he felt that what he had cultivated was lacking -- he had developed his fighting skill so much that nothing would approach him. In contrast, Takuan demonstrated a deep peacefulness and naturalness that led to all, even a snake, accepting him. As to how much of this is legendary or not, I'm not certain, but it's something to contemplate.