It is not sufficient to number the souls that embrace the Cause to know the progress that it is making. The more important consequences of your activities are the spirit that is diffused into the life of the community, and the extent to which the teachings we proclaim become part of the consciousness and belief of the people that hear them. For it is only when the spirit has thoroughly permeated the world that the people will begin to enter the Faith in large numbers.
(From a letter dated 18 February 1932, written on behalf of Shoghi Effendi to an individual believer; The Compilation of Compilations, Vol. III, Promoting Entry by Troops)