" My intention is not to enter into Disputes as my time is too precious for that; what I propose writing I have seen and partly elaborated myself, and am still employed in bringing the same to perfection. Although it is hardly worth a Man's while to bring any proofs concerning the Reality and Existence of our Art, yet if we were not to mention something, our silence would by many be deemed inability, therefore almost against our inclination we see ourselves obliged to relate a few Tracts, the Truth of which cannot be taken in question. It is positively known that Theophrastus Paracelsus was well acquainted with the knowledge of transmuting mercury and lead into gold; this has even been attested by some of his enemies..."