It's one of my favourite quotes and does need repeating often.
Here's the fuller quote:
When your own thoughts are forbidden, when your questions are not allowed and our doubts are punished, when contacts with friendships outside of the organization are censored, we are being abused for the ends never justify the means. When our heart aches knowing we have made friendships and secret attachments that will be forever forbidden if we leave, we are in danger. When we consider staying in a group because we cannot bear the loss, disappointment and sorrow our leaving will cause for ourselves and those we have come to love, we are in a cult… If there is any lesson to be learned it is that an ideal can never be brought about by fear, abuse, and the threat of retribution. When family and friends are used as a weapon in order to force us to stay in an organization, something has gone terribly wrong.”(page 299)
nicked from: http://religiouscultsinfo.com/2010/07/%E2%80%9Cseductive-poison%E2%80%9D-by-deborah-layton-voice-of-a-survivor/