Thought Force, a prosperity theology book, summarizes the principle as "You are what you think, not what you think you are." It was published by Elizabeth Towne, the editor of The Nautilus Magazine, a Journal of New Thought. In his 1910 The Science of Getting Rich. Wallace D. Wattles espoused similar principles — that simply believing in the object of your desire and focusing on it will lead to that object or goal being realized on the material plane (Wattles claims in the Preface and later chapters of this book that his premise stems from the monistic Hindu view that God provides everything and can deliver what we focus on). The book also claims negative thinking will manifest negative results. In 1915, Theosophical author William Quan Judge used the phrase in The Ocean of Theosophy. In 1919, Another theosophical author Annie Besant discussed the 'Law of Attraction'. Besant compared her version of it to gravitation, and said that the law represented a form of karma. Napoleon Hill published two books on the theme. The first, The Law of Success in 16 Lessons (1928), directly and repeatedly references the Law of Attraction and proposes that it operates by use of radio waves transmitted by the brain. The second, Think and Grow Rich (1937), went on to sell 100 million copies by 2015. Hill insisted on the importance of controlling one's own thoughts in order to achieve success, as well as the energy that thoughts have and their ability to attract other thoughts. He mentions a "secret" to success and promises to indirectly describe it at least once in every chapter. It is never named and he says that discovering it on one's own is far more beneficial. Many people have argued over what it actually is; some claim it is the law of Attraction. Hill states the "secret" is mentioned no fewer than a hundred times, yet reference to "attract" is used less than 30 times in the text. Israel Regardie published books with the law of attraction theme as one of his prevailing Universal Laws. In, The Art of True Healing: A Treatise on the Mechanism of Prayer and the Operation of the Law of Attraction in Nature (1937), he taught a focused meditation technique to help the mind to learn to heal itself on a physical and spiritual level. Regardie claimed that the law of attraction was a valid