For example, he termed theurgy "high magick" and thaumaturgy "low magick". Because of this view, some Hermetics also practice theurgy. Jean-Baptiste Willermoz was an ardent adept of Freemasonry and theurgy. They were useful weapons against the momentary resurrection of polytheism, mythology, theurgy, and idolatry. Esoteric Christianity accepts theurgy as a tradition that could greatly benefit a person. Magical operations largely fall into two categories&colon; theurgy () and goetia (). Julian favored ritual theurgy, with an emphasis on sacrifice and prayer. Being the expert in the theurgy, Asclepigenia taught from a metaphysical approach. The principal means of effecting this was by the "praxis" of theurgy and bhakti. Porphyry was opposed to the theurgy of his disciple Iamblichus. In this he agrees with the doctrines of theurgy put forward by Iamblichus. The two men differed publicly on the issue of theurgy. The book remains the seminal work on Theurgy and esoteric arts to this day. Two separate types of occult abilities exist within the game universe&colon; psychic powers and Theurgy. "Theurgy" means "divine-working".