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It is a fundamental law of nature that in order to gain strength one has to push one's limits, which is painful. As Carl Jung put it, "Man needs difficulties. They are necessary for health." Yet most people instinctually avoid pain. This is true whether we are talking about building the body (e.g., weight lifting) or the mind (e.g., frustration, mental struggle, embarrassment, shame)--and especially true when people confront the harsh reality of their own imperfections.