Theatrum chemicum, praecipuos selectorum auctorum tractatus de chemiae et lapidis philosophici antiquitate, veritate, iure, praestantia, & operationibus, continens: in gratiam verae chemiae, et medicinae chemicae studiosorum ... congestum, et in sex partes seu volumina digestum; singulis voluminibus, suo auctorum et librorum catalogo primis pagellis: rerum vero & verborum indice postremis annexo. Volumen primum [- sextum]

In our days, we had Master Arnaldus de Villa Nova in the Roman court as supreme physician and theologian, concerning whom I wrote a council on the observance of fasts. He, who was also a great Alchemist, agreed that the rods of gold which he made should be subjected to every test.

So he says: For Andreas has been carried to the heavens with praises by all the learned, whom Ludovicus Romanus called the most excellent of all men.

Avicenna Ar. vi. is the element of all liquefiable bodies.

For Oldradus and Joan. Andreas prove that that Chemical art, commonly called Alchemy, is true and not forbidden, and that it is not inconvenient for one metal to be transmuted into another. For (as they say) we see that sometimes living is produced from dead matter, as we see from worms, from which silk is produced, and from many others; and from herbs, glass is produced. Much more from metals, in which there is greater convenience and similarity. For (as they record, and it is held in the book of the properties of things in the chapter on Alchemy) all metals proceed from the same principle, namely, from sulphur and quicksilver. Therefore, since art imitates nature (Digest on adoption, Law: If adoption), these Alchemists do not seem to sin. For since they are almost from the same principle, the transition is easier into similar things, in those having a symbol shared property. For there are within them, as blessed Augustine says in his book on the City of God, in corporeal things through all the elements, certain hidden seminal reasons, by which, when temporal and casual opportunity is given, they burst forth into species in their own ways and ends. This is from Oldradus and Joan. Andreas. Which passage of Augustine is cited by Gratian, cause 26, in the 2nd part, q. 5, chap. Nec mirum. Furthermore, Augustine says in book 3 of the Trinity, "For all things, which are born corporally and visibly, certain hidden seeds lie in these corporeal elements of this world." And Gaspar Contarenus the Cardinal, book 3 of Elements, says: "Nevertheless, in the generation of metals, no one doubts that all things are made from quicksilver and sulphur."