In the practice of yoga and also within the martial arts, one’s strength or power comes from the development of a balanced state of mind. One is going back or returning to the origin of the strength that exists within oneself. This kind of strength is known as strength in its own right, the strength of fearlessness. To be without fear is to have great strength.
From “Nonviolence ” in Smile at Fear: Awakening the True Heart of Bravery, pages 45–46.