Siva,
Thanks for your good words. My Yoga knowledge is only experiential and very limited. I will try to suggest answers to your questions.
You ask: Can you say any more about the fear that causes attachment to words and ideas only, logic, reason and science, which although useful are intrinsically limited. Awareness and understanding beyond words and ideas? Is everything beyond words and ideas only faith?
Science will always be limited, because it is exploring truth - bottom-up. From fragmented pieces like physics, chemistry, biology etc. it is trying to make a whole picture which is never possible. Vedanta, on the other hand, is top-down, starts with holistic premise and then applies it to parts of life. So, parts are always as true as the whole.
You are right about attachment. Our ego does that mischief. It makes us own our ideas, thoughts (words), perception and images with a hope to own the objects that are perceived. (I couldn’t understand “fear that causes attachment”) But attachment, as described above, causes fear - fear of losing, fear of transience, fear of death.
Patanjali describes the universe as - gross (physical), subtle (astral) and the subtlest (causal) all perceivable and also the fourth state beyond that can’t be perceived, you can only BE in that state. In perception, form/ appearance is physical, words/ thoughts are astral and ideas/ concepts are causal. Beyond that is an enlightened state. Which is faith, only for us who’s awareness is still only physical. A Yoga Master who has been that state may call it real and not just faith and he/she may claim awareness of it and not just intellectual understanding like us. Hope there is something useful here.