 A historian of esotericism Johnson speculates that the "Masters" that Blavatsky wrote about and produced letters from were actually idealizations of people who were her mentors.Many scholarly reviewers of these speculations, on the other hand, claim that these and similar books attacking Blavatsky and her claims about the existence of such masters are based on poor quality research, specious arguments, and poorly supported speculation.So, from a scholarly point of view, the existence of such masters is considered by many to still be controversial, with neither side being able to establish their claims conclusively.