The following comment on the LCG Yahoo board describes why Armstrongism will NEVER grow or advance as a legitimate church. The idea that you are not to read anything outside Armstrongism's writings shows how utterly bankrupt the beliefs and teachings of the church truly are!
I have no idea why someone who claims to be a church member would
recommend a book or any writing by an unconverted, uncalled person in
whom God's Holy Spirit did not dwell to be used as a guideline for
Christian behavior. I don't care if the authors name is Henry David
Thoreau or someone else for that matter. The Bible Trumps all of
those writings. To imply the scriptures are incomplete as a guide for
Christian behavior and needs to be suplemented by some writing by an
unconverted person reflects the thought pattern of an unstable mind.
Even when a church's government is off track and even abusing people
we can find scriptures to help guide thru such a minefield. If more
time were spent reading the scriptures rather than reading writings
not inspired by God a diligent person could find the scriptural
guidance needed for every conceiveable situation. The Bible is
complete for our time - use it!!!