Thelema
Some groups say that they are true to Crowley's system (such as A∴A∴ and Ordo Templi Orientis). Some groups build upon his teachings, expanding upon and extending them. For example, the Fraternitas Saturni (Brotherhood of Saturn), founded in 1928 in Germany, accepts the Law of Thelema, but extends it with the phrase "Mitleidlose Liebe!" ("Compassionless love!"). The Thelema Society, also located in Germany, accepts Liber Legis and much of Crowley's work on magick, while also including the ideas of other thinkers, such as Friedrich Nietzsche, Charles S. Peirce, Martin Heidegger, and Niklas Luhmann. In America, the writings of Maggie Ingalls (Nema) have started a movement called Maat Magick, along with a group called the Horus-Maat Lodge, founded in 1979. This movement combines elements of Thelema with Nema's system based on the Egyptian goddess Ma'at. She wrote her own holy book titled "Liber Pennae Praenumbra."  The HML aims to combine the current Aeon of Horus with the future Aeon of Ma'at in which mankind will achieve balance.