Besslers hidden work was based upon propositions in Euclids Elements, and so are the Rosy Cross and the Freemasons secret methods.
The great freemason Albert Pike once wrote that "All Masonry is based upon Pythagoras theorem, as described in the 47th proposition of Euclids elements".
Euclid's Elements has been referred to as the most successful and influential textbook ever written. Being first set in type in Venice in 1482, it is one of the very earliest mathematical works to be printed after the invention of the printing press and was estimated by Carl Benjamin Boyer to be second only to the Bible in the number of editions published, with the number reaching well over one thousand. For centuries, when the quadrivium was included in the curriculum of all university students, knowledge of at least part of Euclid's Elements was required of all students. Not until the 20th century, by which time its content was universally taught through other school textbooks, did it cease to be considered something all educated people had read.