"This stone is the spirit in man, which fell from its high position, and has been lost beneath the rubbish of the lower man. This is the true cap stone that is now hidden in the pit of man's temple, and which he must exhume and place again as the true crown of his spiritual pyramid." -The Initiates of the Flame Manly P. Hall pg. 81,83
"And Lucifer, the one rejected by man as the devil, is the one who must through the planet Mars send man the dynamic energy which man himself must transmute from the fire of passion to the flame of spirit. He then must take the tools of the craft and cut and polish his own being into the cap stone of the Universal Temple."-The Initiates of the Flame Manly P. Hall Pg. 83
"There is probably no point that is as important in connection with the pyramid as that of the corner stone. On the very top of the great pyramid is a comparatively flat place about thirty feet square. In other words the TRUE STONE WHICH IS THE HEAD OF ALL THE CORNERS IS MISSING. If we look at the reverse side of the United States seal, we find again the pyramid from which the top is separated.
The value of the stone is better understood when you understand that it completes all of the triangles atonce, and without it none of them are complete." -The Initiates of the Flame Manly P. Hall pg 81
"When Atlantis ruled the word, that which is now America was connected with Egypt by what is now Mexico, and in Mexico, in the territory of Yucatan, there is a Pyramid in which the Fire Philosophers worshiped God as Divine Fire and Life in like manner as did the Initiates of Egypt, for the two were then one. America is not complete, and will not be complete, cannot be complete, until Mexico is again part of America as she was in the long ago, and when Mexico is once again a part of the United States, then will the cap‐stone have been set on the Pyramid and the reverse side of the United States seal will be cut. Thus you will see that the Soul Science Primer with its drawings, is but the beginning of the article concerning the Seal of the United States, while the article on 'Body, Mind, Spirit and Soul' is the finale thereof. May it not be long until the Holy Pyramid shall be completed and may it be completed without the shedding of blood. Lovingly given, R. Swinburne Clymer. 'Beverly Hall,' Quakertown, Pennsylvania, July 6th, 1916."-Fundamental Laws: A Report of the 68th Convocation of the Rose Cross Order: pg. 24
"The (on the reverse side of the United States seal) 72 stones are the 72 arrangements of the Tetragrammaton, or the four-lettered name of God, in Hebrew. These four letters can be combined in 72 combinations, resulting in what is called the Shemhamforesh, which represents, in turn, the laws, powers, and energies of Nature by which the perfection of man is achieved. The Pyramid then is the Universal house, and above its unfinished apex is the radiant emblem of the Great Architect of the Universe." - The Secret Destiny of America - Manly P Hall
" PYRAMID is symbolic of the shape of the human chakra. The missing capstone represents the unfinished work and the ALL-SEEING EYE represents the gnosis and all-knowing when one reaches the godhead. This state is also known as "SAMADI" or "SUPER CONSCIOUSNESS." ...
... The United States, government and all, was founded upon Masonic prinicples and is not Christian by any stretch of the imagination. Original Freemasonry was of Satan." - Joy of Satan compiled by: Logan McDonnell Information by: JoyOfSatan.com Pg. 83
https://ipfs.busy.org/ipfs/QmX93ax9B8psq44KGPpxdhUUJeqDzVjdvQMkhoN4iNQrGz
Here is an overhead view of Dealey Plaza. This will allow you to see the around Dealey Plaza forms a a truncated pyramid with the capstone missing by the Triple Overpass. John F. Kennedy was killed almost at the part where the capstone (top half) is missing.