 Heindel returned to America in the summer of 1908 where he at once started to formulate the Rosicrucian teachings, the Western Wisdom Teachings, which he had received from the Elder Brothers, published as a book entitled "The Rosicrucian Cosmo-Conception" in 1909.It is a reference work in the Christian mysticism practice and in the Occult study literature, containing the fundamentals of Esoteric Christianity from a Rosicrucian perspective.The "Cosmo" contains a comprehensive outline of the evolutionary processes of man and the universe, correlating the science of his day with religion.