 The polemical discourses about magic influenced the self-understanding of modern magicians, a number of whom—such as Aleister Crowley and Julius Evola—were well versed in academic literature on the subject.According to scholar of religion Henrik Bogdan, "arguably the best known emic definition" of the term "magic" was provided by Crowley.Crowley—who favoured the spelling "magick" over "magic" to distinguish it from stage illusionism—was of the view that "Magick is the Science and Art of causing Change to occur in conformity with Will".