Some Christian churches are divided into lay members and clergy—part-time and full-time. But our Church takes a different approach.
Everyone progresses at his or her own individual rate of spiritual growth, but there is no category for part-time Christian Scientist. There are no plateaus of study on which one expects to come to rest and say, "That's fine; I'm comfortable. That's enough for me!"
The whole textbook of Christian Science, Science and Health with Key to the Scriptures by Mary Baker Eddy, is everyone's working basis. No aspects of its teaching are reserved for any supposedly "advanced" group. Even the chapter on Christian Science teaching is there for everybody to study at any time.