The Causal Body has been defined as a “body” which is no body either objective or subjective, but Buddhi, the Spiritual Soul. The other substances or qualities that form man’s nature, the Etheric, Mental, and Astral bodies, exist for one incarnation only while the Causal Body is immortal and persists throughout man’s evolution.

Discussions about the higher soul, the process of incarnation, group souls, and evolution are all parts of this book.