Orison Swett Marden (1897). “Rising in the World: Or, Architects of Fate; a Book Designed to Inspire Youth to Character Building, Self-culture and Noble Achievement”
Letter to "Weird Tales" editor Edwin Baird, printed in "Weird Tales" 3, no. 3 (March 1924); Quoted in "Lord of a Visible World: An Autobiography in Letters" edited by S. T. Joshi, (p. 122), 2000.