1866–1949 — Author of The Master Key System
Haanel was a St. Louis businessman who wrote the most systematic training course New Thought produced: twenty-four weekly parts, each with one exercise, building attention into a usable faculty. It was sold by post from 1912 and has never really gone out of circulation since.
Haanel was born in Michigan in 1866 and spent his working life in St. Louis, where he built and ran a manufacturing and trading business. He came to this material as a practitioner rather than a preacher, and the writing shows it: the tone throughout is of a man explaining a process he uses.
He issued The Master Key System first as a correspondence course, posting one part a week to subscribers from 1912, and collected it in book form in 1916 with a further printing in 1919. He wrote several other works afterwards, none of which reached the same readership.
The course has an argument and a drill, and the drill is the part most readers skip. Haanel's claim is that thought is a creative force, that the force is directed by attention, and that attention is a trainable faculty like any other. So the exercises begin absurdly simply — sit still for fifteen minutes — and add one demand at a time over twenty-four weeks.
Haanel sits between Troward's mental science and the practical visualisation writing of the 1920s. He takes Troward's distinction between the conscious and subconscious and turns it into a syllabus with homework.
The often-repeated story that Napoleon Hill credited the course for his success rests on a 1919 letter reproduced in the book's own front matter. We host that page as printed; treat it as the publisher's promotional material of its time rather than as independent evidence.
One part per week, doing the exercise daily, is the way it was designed and the only way the graded difficulty makes sense. Read straight through, it feels repetitive — because half a year of spacing has been removed.
The world within is the Universal fountain of supply, and the world without is the outlet to the stream.
The Master Key System, Part One, 1919
Mind is creative, and conditions, environment and all experiences in life are the result of our habitual or predominant mental attitude.
The Master Key System, Part One, 1919
It is a twenty-four week course in directed attention. Haanel argues that outer conditions reproduce inner states, then trains the reader week by week in stillness, concentration and detailed visualisation, with one exercise per part.
Yes. It was published in the United States in 1916 and reprinted in 1919, so it is in the public domain there. The complete text is in our Source Archive at no cost and with no email required.
Twenty-four weeks if you follow it as written, one part and one daily exercise per week. Reading it straight through takes roughly five hours.
Dates and biographical details follow the published record. Quotations are reproduced verbatim from the editions named beside them; where we host the text in full, the citation links to it.