This is the enduringly popular philosophy of Aleister Crowley (1875 - 1947, left), based around the central concept of "Do What Thou Wilt shall be the whole of The Law," and the key text Liber AL vel Legis (The Book of the Law), which he apparently received from a non-human intelligence in 1904. Thelema is ostensibly a distillation of Golden Dawn magic, Rabelais, Sex Magic, the Egyptian Mysteries, Abramelin, Yoga, Buddhism, and Taoism.
A form of ceremonial magick and a religion. The Thelemites are a magickal and religious order based upon the teachings of Aleister Crowley. Their beliefs may be summed up by the phrase: "Do what thou wilt shall be the whole of the Law, Love is the Law, Love under Will", which basically translates as: "do whatever you like, but don't fuck with people without good reason". This however doesn't go anywhere near explaining the compexities of Thelemic belief. Popular Thelemic Authors: Aleister Crowley, Israel Regardie
The name that Aleister Crowley used to describe his religion, a mix of magick, Christianity and Gnosticism — basically, the belief that humans are essentially outside the material universe. The name means 'free will' in Greek and Crowley used it to denote his most important and best-remembered doctrine: 'Do what thou wilt shall be the whole of the law.' The writer and pornographer Frank Harris was a fellow Thelemite. (See also Free Love and Magick.)