In these lectures - also published in From Mammoths to Mediums - Steiner covers a wide range of topics, from the development of independent thinking and the ability to think backward, to the uses of what seems boring and the reversal of thinking between the physical and spiritual worlds.

30 NOV 2009; Trans. W. Stuber, M. Gardner (4 lectures, Dornach, June 28-July 18, 1923, GA 350); SB; 96pp; 21 x 14 cm; pb;