I just came across this. If this is true, it explains a lot. It's easy to "read" five books a day, if you start on p. 69 and then just read the right-hand pages. You might find some "interesting quotes," but you are not making a serious attempt at understanding the material, even if you use index cards.
Actually, come to think of it, I should have read his books in precisely this way.
1. See also Really?