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Fear can be classified as mental fear, vital fear and physical fear. Mental fear—all who have a little control over themselves or any human dignity can eliminate it; vital fear is more subtle and asks for a greater control; as for physical fear, a veritable yoga is necessary to overcome it, for the cells of the body are afraid of everything that is unpleasant, painful, and as soon as there is any unease, even if it is insignificant, the cells of the body become anxious, they don't like to be uncomfortable. And then, to overcome that, the control of a conscious will is necessary. <ref>http://incarnateword.in/cwm/09/19-june-1957#p6</ref>