The Greatest Secret in the world has been acclaimed by experts in the field of inspirational literature as a fitting companion to its best-selling predecessor, the Greatest Salesman in the World. According to many of today's publishing standards, the Greatest Salesman in the world should never have become a best seller. But something extraordinary happened to The Greatest Salesman, that peculiar phenomenon called "word of mouth advertising" which happens to a book once or twice each decade. Hundreds of thousands of copies in hard cover form have already been sold since it first appeared in 1968 and it continues to sell at the rate of thousands of copies per week.