theurgy (n.) Look up theurgy at Dictionary.com
1560s, "white magic," from Late Latin theurgia, from Late Greek theourgia "a divine work, a miracle, magic, sorcery," from theos (genitive theou) "a god" (from PIE root *dhes-, forming words for religious concepts) + -ergos "working" (from PIE root *werg- "to do"). From 1858 as "the working of divine forces in human affairs." Related: Theurgical.