Karl von Eckartshausen (28 June 1752 - 12 May 1803) was a German Catholic mystic, author, and philosopher and The Cloud upon the Sanctuary is "the weakness of our nature unable to support light, the curtain which veils the great Something which is the inmost of the Holy Mysteries". But "God and Nature have no mysteries for their children and so the inmost of the Holy Mysteries has never been hidden from the piercing gaze of him who can bear the light." Moreover, "Divinity bends to the weakness of its creatures and writes the truth that is interior and eternal mystery to the outside of things, so that man can transport himself through this to their spirit." The Cloud upon the Sanctuary (Die Wolke über dem Heiligtum) has been scanned from the periodical "The Unknown World" and corrected by hand. The book was given a high status in the Hermetic Order of the Golden Dawn, particularly by Arthur Edward Waite and it is known to have attracted English author and the founder of Thelema, Aleister Crowley, to the Order. We let the readers be the judge of why that happened. As far as Magisteria is concerned, the book contains isomorphic truths written in a "extraordinarily simple language, so much that so that many may consider that he hides deeper matter purposely", in "simple fashion, one more suitable to the plane of intellectuality on which we usually are" as the translator of the book, Isabel de Steiger, has noted.