Musashi Miyamoto    
Book of Five Rings
Main Principles
The Nine Main Principles

In the Book of Five Rings, there are many principles, techniques, and strategies that Musashi presents in describing his Ni Ten Ichi Ryu school and how to attain the Way of strategy. Some of the most well known are the general guiding rules at the end of the Ground section of Musashi's book. These include:

1. Do not think dishonestly.
2. The Way is in training.
3. Become acquainted with every art.
4. Know the Ways of all professions
5. Distinguish between gain and loss in worldly matters.
6. Develop an intuitive judgement and understanding for everything.
7. Perceive those things which cannot be seen.
8. Pay attention even to trifles.
9. Do nothing which is of no use.