The Corpus Hermeticum is a collection of dialogues and treatises in Greek, purportedly teachings of hermes-trismegistus. Its vision is of a living cosmos, ordered by correspondence, in which the mind that knows and the mind to be known are one.
Rediscovered by Marsilio Ficino in the 15th century, the Corpus was believed to be older than Moses; modern scholarship places it in the first centuries CE. Whatever its date, it catalyzed Renaissance magic, alchemy, and a current of Western esotericism that runs through the present day.