Rapp and his group also practiced forms of Esoteric Christianity, Mysticism (Christian mysticism), and Rapp often spoke of the virgin spirit or Goddess named Sophia in his writings. Philipp Jakob Spener, and Emanuel Swedenborg, among others. Also, in Economy, Pennsylvania, there are glass bottles and literature that seems to indicate that the group was interested in (and practiced) alchemy. Some other books that were found in the Harmony Society's library in Old Economy, Pennsylvania, include those by the following authors: Christoph Schütz, Gottfried Arnold, Justinus Kerner, [http://www.passtheword.org/Thomas-Bromley/ Thomas Bromley, Jane Leade, Johann Scheible ("Sixth and Seventh Books of Moses"Paracelsus, and Georg von Welling ([http://www.esoteric.msu.edu/Archive/Welling.html "Opus Mago-Cabalisticum"), among others.