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To attain that concentration much effort is necessary; an immediate or even a quick result is rarely possible. But if the inner door has once been opened, you may be sure that it will open again if you know how to Perseverepersevere. <ref>The Mother. (2002). 25 Dec 1950. In "Questions and answers (1950 - 1951)" http://incarnateword.in/cwm/04/25-december-1950#p21 </ref>