Thelema (/θəˈliːmə/) is a religion based on a philosophical law of the same name, adopted as a central tenet by some religious organizations. The law of Thelema is "Do what thou wilt shall be the whole of the Law. Love is the law, love under will." The law of Thelema was developed in the early 1900s by Aleister Crowley, an English writer and ceremonial magician.