In a word, excellent.

As a precursor to the Book of Five Rings one should be aware of the Japanese mind. The Buddhist principle of emptiness is also helpful, albeit not necessary. In the Book of Five Rings Musashi gives the pupil the understanding of how to win in battle.

Musashi lived in the hieght of the Japanese Reniassance. There were wars thus the need for warriors. But, there was vast amounts of culture, arts, drama, even tea ceremonies. There are allusions to all these aspects of culture, but ultimately, martial arts is the focus here. It is not a learners guide to structure or even a style of martial arts, rather The Book of Five Rings is a contemplative guide to the mindset of a warrior.

The essence of his work is simple, win, be victorious. Know the mind and rhythm of your enemy and train constantly. Be vigilant.

All that said, Musashi's work can be applied to any walk of life, not just the warrior's way. This is the true genius of Musashi. I believe I will revisit this one from time to time.