About the Temple Legend, which is at the basis of Freemasonry. Has to do with The Temple of King Solomon. Hiram is the master builder, and the Queen of Sheba has to choose between Solomon (detached piety unconcerned with worldly or the Son of Cain, Hiram, who is engaged in the building of the temple. She is the Soul of Humanity and chooses Hiram.
Steiner then goes into how masons in the past built masterful buildings (pyramids, irrigation channels, cathedrals) that integrated the cosmos in that they were built in relation to certain stars and solstices, etc, as well as engineering acoustical effects within the buildings, without the mathematical knowledge we have today. Modern architects are not yet able to replicate the acoustical effects of the buildings of yore. In earlier times, men were able to build by means of intuitive faculties, not through rational understanding (78).
The measurements of the Egyptian pyramids correspond to certain measurements in heavenly space. The whole configuration of stellar space was depicted in these buildings (78).
Towards the end, Steiner then addresses how the Masters of the White Lodge weave their master plan into the atom. Our current atom is an image of the master plan from the previous round (the 3rd round--Old Moon). Today, the masters are working and weaving the atom that will exist in the 5th round--the Jupiter phase (187).
Lec. 19 is one of the most amazing Steiner lectures I have read.