So you must not be frightened if a sadness arises before you larger than any you have ever seen, if an anxiety like light and cloud shadows moves over your hands and everything that you do………….  Why do you want to shut out out of your life any uneasiness, any miseries, or any depressions? For after all, you do not know what work these conditions are doing inside you.  (Rainer Maria Rilke, Letters to a young Poet)