Pioneers entering the pioneer field should realize that main aim is to spread Baha'ism

"...The principle is that pioneers entering the pioneer field should realize that they are going there to represent the Cause, in fact, to be the Cause. Their minds and their hearts should be centered in their new tasks and in their new environment. The should not be thinking of when they can return home, or when they can go somewhere else. Only when the Faith is firmly established should they give any thought to moving, and then, only in consultation with the National Assembly."

(From a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of Germany and Austria, June 28, 1954)

http://bahai-library.com/hornby_lights_guidance_2.html&chapter=4#n1953