Knowledge of the Higher Worlds and Its Attainment, by Rudolf Steiner, , at sacred-texts.com
Prepared at sacred-texts.com, November 2007. This text is in the public domain in the United States because the original text was published prior to 1923, and the translation, which was published in the US in 1947, shows no copyright renewal as required by law at the time.
Authorized English Translation by George Metaxa. Revised by Henry B. and Lisa D. Monges.
This translation has been authorized for the Western
Hemisphere by agreement with the Rudolf Steiner
Nachlassverwaltung, Dornach, Switzerland.