Jon Klimo, in "Investigations on Receiving Information from Paranormal Sources", writes, "As with Blavatsky/Theosophical material, and more recent contemporary channeled material from other sources, we find in the Bailey work the same occult cosmological hierarchy: physical, etheric, astral, mental, causal, and higher inhabited levels of existence." Olav Hammer, in the book "Claiming Knowledge: Strategies of Epistemology from Theosophy to the New Age", highlights Bailey's Theosophical similarities as well as noting what he thinks are some differences between them: "To a large extent, Bailey's teachings are a restatement and amplification of theosophy of the "Secret Doctrine." Bailey inherited from Blavatsky and Leadbeater a predilection for profuse details and complex classificatory schemes. ... Her books have also introduced shifts in emphasis as well as new doctrinal elements."