A link to Emily Dickinsons explanation of the affect remorse has on the memory.
http://famouspoetsandpoems.com/poets/emily_dickinson/poems/9446.html

Reading through the first chapter of The Art of Memory I've become quite excited by the idea of have a rewind inside of my mind once again. My only question to you and everyone else is what if you once had it- but than have since lost it? Is such a thing regainable? The memory is but a part of the brain so what happens when the mind decides to block the things it dislikes, the things that displeases it, what then? Can such vision be regaind by reading such a book and applying the knowledge?

What happens when the memory sticks in your mind and can't be understood? Does your brain stall like a car, and wait for you to start it over. What have you missed in the mean time?