Fearlessness will also be punctuated by occasional fear, uncertainty, and confusion. Fearlessness comes from fear. The logic is quite simple. You might ask, for example, why someone takes a shower. You shower because you feel dirty. You aren't inspired to shower purely because you have clean clothes in your closet. We might say that basic goodness is like the clean clothes in your wardrobe. It's great to know they are there, but it's not always enough motivation to get you to shower. The dirt is what really makes you want to clean up. Similarly, fearlessness comes from fear. . . . When as warriors we experience doubt and fear, then by rousing both our mind and body so that they are joined together, a good dose of fearlessness comes into our state of mind and is reflected in our body as well. Then we can appreciate the basic goodness we possess.
From "Joining Heaven and Earth," pages 76 to 77, in Smile at Fear: Awakening the True Heart of Bravery, now available from Shambhala Publications.