Upon entering the age of materialism around 5000 years ago knowledge about the anatomy of the soul became part of various esoteric traditions. It was therefore kept private among a few initiates. In the Himalayas it was knowledge passed down orally, from master to disciple, and recorded in texts like the Puranas or the Tantras. In ancient Egypt and Sumer, it was transmitted through various mystical schools. With the arrival of Islam, many of these schools became Sufi brotherhoods. In the West, because of the power associated with this knowledge, various secret societies were founded, keeping...