From the Watchtower website article on propaganda:
"However, we do not want to be so narrow that we refuse to consider facts that can improve our thinking. How can we find the right balance? By adopting a standard with which to measure new information. Here a Christian has a source of great wisdom. He has the Bible as a sure guide for his thinking. On the one hand, his mind is open, that is, receptive to new information. He properly weighs such new information against the Bible standard and fits what is true into his pattern of thinking. On the other hand, his mind sees the danger of information that is entirely inconsistent with his Bible-based values."
The bait = Claim established for consider facts, importance of standard of judging.
The switch = The bible is a "sure guide"
No proof has been given. It has been a linguistic dance to cheer-lead the way to the bible.