|You can find this online here.
First, I must explain that Thomas Vaughan was a very religious man and his study of Alchemy, while a bit unorthodox, fit within his religious faith as he defined Magic in this manner:
Magic is nothing else but the wisdom the the Creator revealed and planted in the creature. . . . Magicians were the first attendants our Savior met withal in this world, and the only philosophers who acknowledged him in the flesh before that he himself discovered it. I find God conversant with them, as he was formerly with the patriarchs; he directs them in their travels with a star, as did the Israelites with a a pillar of fire; he informs them of future dangers in their dreams, that having first seen his Son, they might in the next place see his salvation.*