The three principles of the sun, the echo, and the bow and arrow are all connected with the natural process, or path, of working with our basic intelligence. Beyond that, they describe the fundamental decorum and decency of the warrior's existence. A warrior should be capable of artfully conducting her or her life in every action, from drinking tea to running a country. Learning how to handle fear, and how to utilize both our own and other people's fear, is what allows us to brew the beer of fearlessness. You can put all those situations of fear and doubt into a gigantic vat and ferment them.
From "The Tools of Bravery, " page 67, in Smile at Fear: Awakening the True Heart of Bravery.