Within the system of Theosophy, developed by occultist Helena Blavatsky and others since the second half of the 19th century, Theosophical mysticism draws upon various existing disciplines and mystical models, including Neo-platonism, Gnosticism, Western esotericism, Freemasonry, Hinduism and Buddhism.
The three fundamental propositions expounded in The Secret Doctrine are –
Helena Blavatsky taught that Theosophy is neither revelation nor speculation. Blavatsky stated that Theosophy was an attempt at a gradual, faithful reintroduction of a hitherto hidden science called the occult science in Theosophical literature. According to Blavatsky occult science provides a description of reality not only at a physical level but also on a metaphysical one. Blavatsky said occult science had been preserved and practiced throughout history by carefully selected and trained individuals.
The Theosophical Society believes its precepts and doctrinal foundation will be verified when a Theosophist follows prescribed disciplines to develop metaphysical means of knowledge that transcend the limitations of the senses.
Theosophy was considered by Blavatsky to be "the substratum and basis of all the world-religions and philosophies". In The Key to Theosophy, she stated the following about the meaning and origin of the term:
ENQUIRER. Theosophy and its doctrines are often referred to as a new-fangled religion. Is it a religion?
THEOSOPHIST. It is not. Theosophy is Divine Knowledge or Science.
ENQUIRER. What is the real meaning of the term?
THEOSOPHIST. "Divine Wisdom," (Theosophia) or Wisdom of the gods, as (theogonia), genealogy of the gods. The word theos means a god in Greek, one of the divine beings, certainly not "God" in the sense attached in our day to the term. Therefore, it is not "Wisdom of God", as translated by some, but Divine Wisdom such as that possessed by the gods. The term is many thousand years old.
ENQUIRER. What is the origin of the name?
THEOSOPHIST. It comes to us from the Alexandrian philosophers, called lovers of truth, Philaletheians, from phil "loving," and aletheia "truth". The name Theosophy dates from the third century of our era, and began with Ammonius Saccas and his disciples, who started the Eclectic Theosophical system.