One of the most significant texts by W.W. Atkinson, Mastery of Being: A Study of the Ultimate Principle of Reality and the Practical Application Thereof breaks into three parts the principles of reality, including atoms, the spirit, and physical manifestation. He uses theories and popularly accepted ideology to prove that reality is true, and uses his ideology to describe how we can apply reality to life, and become "masters of being." American writer WILLIAM WALKER ATKINSON (1862-1932) was editor of the popular magazine New Thought from 1901 to 1905, and editor of the journal Advanced Thought from 1916 to 1919. He authored dozens of New Thought books under numerous pseudonyms, including "Yogi," some of which are likely still unknown today.