Source, in full
I:40 This famous statement derives from several historic precedents, including that of François Rabelais in describing the rule of his Abbey of Thélème in Gargantua and Pantagruel: Fait ce que vouldras (Do what thou wilt), which was later used by the Hellfire Club established by Sir Francis Dashwood. It is also similar to the Wiccan proverb: An ye harm none, do what thou wilt; but the oldest known statement of a similar assertion is that of St. Augustine of Hippo: Love, and do what thou wilt.