Musashi said, As long as we have our lives and we are here on this earth, we have to try a create for ourselves a wonderful and peaceful life. In order to do that we must have a peace of mind and a strong sense of morality. But considering the history of morality we also need great strength. We therefore train in a martial way for the security and peace of our countries The maxim of practice is based on The sword is the heart.

If the heart is not correct our sword is not right either. If one does not wish to learn about the sword one must still study matters of the heart first. This is the way of dealing with swordsmanship. People who are considered to be experts in Kendo say that Kendo is a way of building up human characteristics by practicing the natural laws of the sword”.

Musashi’s thoughts on this were, “Since we are born and live on this earth we should face God and give birth to children and increase the human race and make everybody happy. In order to do this we have to face the unavoidable and our fatality, our meaning of life. Shukumei wo motteiru. To understand what we are born with”. The strength to face fatality is called Bu by Musashi. Bu means an honest feeling and an honest heart. This honesty is based on the thoughts of God.

Musashi also uses the word Chokudo. This means, “To take a straight path” Lots of people try to persuade you with lessons as to what you should do in life. Musashi says if you just listen and don't take action it means nothing. Buddha preached his Buddhism but did this make India happy? Look at the country now. The same can be said for Jesus Christ. What are the Jews doing now? Musashi put his strength and effort into the meaning of life which was greater than his fatality. and he called it his Bu his name starting with Mu has the same meaning. “An honest feeling and an honest heart”.

Yagyu had said one should look at ones enemy as a great boulder rolling down a mountain towards you. With Musashi's thoughts towards this he considered the power of falling water, be it a a drop or a waterfall.

Musashi's Waza is empty without Musashi's Mu.