I've been reading Prometheus Rising to my fiance. I am so refreshed by Old Bob's spirit of curiosity and open-mindedness.
He encourages us to experiment with our consciousness -- try out different beliefs, see how they feel. Don't be judgmental. He doesn't tell you how to think at all. He suggests that we try out one reality tunnel for a bit (you found the quarter via "selective attention"). Then, try out another (you found the quarter using "the powers of your mind"). Then, compare the two yourself. Old Bob encourages us to explore reality ourselves, in person, not through other people's accounts.
This first chapter of PR discusses how our part of our mind ("the Thinker") quickly leaps to conclusions (likely based on an emotional state), and then the "Prover" reacts to this by building a scaffolding of logic and reason to support that conclusion.
My man G.I. Gurdjieff warns us about this too - he says that the intellect is slave to the emotions. Emotions are fast, automatic--reason is always struggling to catch up and justify / explain those feelings. Logic is not objective - the reasoning part of your mind can go anywhere; you could reason your way into a "Flat Earth" reality tunnel if you are emotionally invested in it. Awareness of this process gives us the potential to be free from it. For a little while, at least. It's really easy to become attached to our own thoughts, and it happens in subtle ways.
Bob encourages us to observe this process dispassionately in friends and strangers. "Try to figure out what their Thinkers think, and how their Provers methodically set about proving it. SECOND, apply the same exercise to yourself."
Bob's strongest advice is in the exercises - "Avoid coming to any strong conclusions prematurely. At the end of a month, re-read this chapter, think it over again, and still postpone coming to any dogmatic conclusions. Believe it possible that you do not know everything yet, and that you might have something still to learn."
That youthful curiosity, the attitude of approaching life like an explorer, the emphasis on self-skepticism... that's the Robert Anton Wilson spirit.