Border Collie, thank you!!! Those are all good ideas. You're right about the mind. That's how I commit most of my sins.
Carmel, thank you. I think John of the Cross is so beyond me...His writings are a real challenge to me!!!
In my humble opinion I feel if I find a book hard going then it perhaps is not the right time to read it. On the other hand when I do read one that is the right one I feel blessed and can feel the witness of the Holy Spirit within me. And I always remember what I read years later, but would forget what was in the one that I struggled with.