Frizius and Fludd contribute also a letter supposed to have been sent by rosicrucians to a German candidate. It says, “Since you are such a stone as you desire, and such a work ... cleanse yourself with tears, sublimate yourself with manners and virtues, decorate and color yourself with the sacramental grace, make your soul sublime toward the subtile meditation of heavenly things, and conform yourself to angelic spirits so that you may vivify your moldering body, your vile ashes, and whiten them, and incorruptibly and painlessly gain resurrection through J[esus] C[hrist] O[ur] L[ord].” In another passage: “Be ye transformed, therefore, be ye transmuted from mortal to living philosophic stones.” In the “Clavis Philosophiae et Alchymiae Fluddanae” (published in Latin in 1633), are passages like the following: “Indeed every pious and righteous man is a spiritual alchemist.... We understand by that a man who understands not only how to distinguish but with the fire of the divine spirit to separate [spagiric art] the false from the true, vice from virtue, dark from light, the uncleanness of vice from the purity of the spirit emulating God. For only in this way is unclean lead turned into gold.” (P. 75.) “If one now ventures to say that the Word of Christ or the Holy Ghost of wisdom dwells in the microcosmic heaven [i.e., in the soul of man] we should not decry the blind children of the world as godless and abandoned. [But certainly the divine spirit is, as is later averred, the rectangular stone in us, on which we are to build.] This divine spark is, however, continuous and eternal; it is our gold purchasable of Christ.... So it happens in accordance with the teachings of Christ, or the Word become flesh, that if the true alchemists keep on seeking and knocking, they attain to the knowledge of the living fire.” (P. 81.) So again the important knocking and seeking of masonic symbolism, and this indeed, for the purpose of learning to know a fire. In reference to the really elevating thoughts of the “Summum Bonum,” Katsch, enthusiastic about these ideas, exclaims: “What language, what an unflinching courage, what a dignified humility. Even the most reluctant will not be able to avoid the admission that here quite unexpectedly he has ... met the original and ideal form of freemasonry.” The comparison of masonry and alchemy remains true even if we work more critically than Katsch, who is accused of many inaccuracies. I recall for instance the later researches of the thorough and far-seeing Dr. Ludwig Keller. For the illumination of the darkness that has spread over the past of freemasonry, Keller shows us (B. W. and Z., pp. 1, 2) the rich material of symbolism that is offered the diligent student, first of all in the very copious literature, printed matter, and especially in the manuscripts, that is known by the name of Chemistry or Alchemy.