"It is tough to discover that what you have believed in and invested your time in for so many years is a false hope and even a fraud/scam. You can spend hours and a lot of verbiage in rationalizing justification and excuses to continue the learned belief system." - Douglas A. Wallace
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"You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan
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Ray Franz admitted in "Crisis of Conscience" that after his research, Re: Watchtower's date of 607 BCE as Jerusalem's destruction, he could not prove that date as true- he knew WT was wrong and disagreed with ALL of the available evidence. Yet, when ordered to write the single longest article in Aid to Bible Understanding on chronology supporting the 607 date as legitimate, he did it anyway, despite knowing what he was writing was not true. And, Ray was at the top, a member of the governing body!! If he could deny the facts and knowingly promote a falsehood, why would we expect those in lower positions at WT to do any differently?
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I think most of those in power at WT believe that what they print is true- otherwise they would not have a "zero tolerance" policy toward those who disagree with it. However, as Ray's experience reveals, even when they don't believe something, or the foundation of a belief is untenable at best, it gets printed as "truth" anyway.