Steiner led a lodge called Mystica Aeterna within the Masonic Order of Memphis and Mizraim, from 1906 until around 1914.

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In 1896, Elisabeth Förster-Nietzsche asked Steiner to help organize the Nietzsche archive in Naumburg. Her brother by that time was non compos mentis. Förster-Nietzsche introduced Steiner into the presence of the catatonic philosopher; Steiner, deeply moved, subsequently wrote the book Friedrich Nietzsche, Fighter for Freedom.