By keeping their members as separate from the world as possible, not being allowed to discuss any problems, fears, inconsistencies etc for fear of being labelled an 'apostate', they are cocooned from realizing that:
OTHER FANATICAL RELIGIONS OR CULTS SAY THE SAME THING AND HAVE PREDICTED THE END OF THE WORLD SINCE THE BEGINNING OF TIME. You are no different!!
They NEED their members to believe that they are being persecuted, that they are a threat to the world because it perpetuates this 'unique' 'chosen' 'special' 'exclusive information belongs only to us' kind of thinking...which eventually leads to the ability to control people due to their fears.
Is it not painfully obvious that they are NOT worshipping God out of love rather they are encouraging fear and a militant attitude amongst their ppl, because this quote is just not true, so why would they use it?
Jez