Emmet Fox published The Golden Key on June 1, 1931, the same year Nona Brooks ordained him into Divine Science and set him on the path to the Hippodrome pulpit. The pamphlet is six pages long and teaches one method: when a problem will not leave the mind, stop giving it attention and turn attention to God instead, on the premise that a mind occupied with God rather than with the difficulty finds the difficulty resolving itself.
That is a small claim for a text DeVorss & Company has kept in continuous print for nearly a century, and it undersells the reach the pamphlet actually had. Secondary accounts report translations into French, German, Spanish, Portuguese, Greek, Russian and Hindustani, the last reaching readers well outside any market Divine Science's own congregations ever served, and later popular spiritual writers including Wayne Dyer, Esther Hicks and Louise Hay have named it as an influence on their own work. The precise sales total reported in the millions could not be traced to a primary publisher's record and is carried here as a reported figure rather than a counted one.
Read next to The Sermon on the Mount, published three years later from the same pulpit, The Golden Key makes the same point Fox's longer book makes about Divine Science's own teaching that thought directed rightly shapes circumstance, compressed to its shortest possible statement and handed to readers who mostly never knew, and did not need to know, which denomination's minister had written it.