The Theosophical Society is the organizational body of Theosophy, an esoteric new religious movement. It was founded in New York City, United States in 1875. Among its founders were Helena Blavatsky, a Russian mystic and the principal thinker of the Theosophy movement, and Henry Steel Olcott, the society's first president. It draws upon a wide array of influences, among them older European philosophies and movements such as Neoplatonism and occultism, as well as parts of eastern religious traditions such as Hinduism and Buddhism.

The seven principles of the human being are: Atman (the universal self), Buddhi (the intellectual principle), Manas (the mental principle), Kama (desire), Prana (subtle vitality), Linga-sarira (astral body), and Sthula-sarira (gross physical matter).

a 1908 book on Hermetic philosophy, was officially credited to a mysterious group known as "The Three Initiates." However, it is widely believed to have been written by William Walker Atkinson. 

Atkinson was a prolific writer and key figure in the New Thought movement. The book is considered a fundamental text of modern occultism, outlining Seven Hermetic Principles.   He became a major proponent of the idea that thoughts influence circumstances. 

Atkinson’s work on "thought-force" essentially laid the groundwork for modern self-help, positive thinking, and the "law of attraction" movement. 

Alice Bailey (1880–1949)

Background: Esotericist, theosophist, and writer.

Movement: Broke away from the Theosophical Society to create her own distinct path.

Style: Known for her 24 books of esoteric teachings, which she stated were telepathically transmitted by a Tibetan Master, Djwal Khul.

Key Works/Organizations: Founded the Arcane School (part of Lucis Trust) in 1923. Known for A Treatise on White Magic, Esoteric Psychology, and Initiation, Human and Solar.

Themes: Soul control, meditation, the "Externalisation of the Hierarchy," and the Seven Rays.