For the most part, we are not just sitting; we are nursing delusions one after another. There is often this feeling that I am doing shikantaza. When we have this feeling, then shikantaza is not at all shikantaza. Instead, there is some kind of maneuvering, some kind of action of one’s self. Do not be fooled by words and ideas.
from Appreciate Your Life: The essence of Zen practice by Taizan Maezumi Roshi
108zenbooks 
yes, I always notice this strange ability to think and think I am following the breath. Pure delusion! I have this book and haven’t looked at it in a long time. Perhaps it is time to dust it off.
I found the secret to reading these books: assign them for sangha study groups!