Reading through a book is easy. Gaining understanding from it is the harder thing.
Andrew Soltis states that much chess learning is done subliminally and thus when we read chess literature it registers in our subconscious and when we meet similar positions playing practical chess, our minds is able to draw it to the fore. The idea being that if we simply absorb material it will at some point be of benefit. I cannot say it has worked in my case but its an interesting idea never the less. There is of course a disparity that exists between chess knowledge and chess ability.
^^ That's pretty much what I've done. I actually just bought the new editions (2007) of My System and Chess Praxis earlier this morning, and I'm working through the video compenium of My System that guy has up on Youtube. It's been really enjoyable thus far.
Of course, I also have a couple of Seirawan books already, too but I think I'm going to have to control myself and finish the material I now have before I accumulate any more lol.
I think the consensus about Nimzoveitchs books are that they were good for the time but that he was a little too dogmatic judging by modern standards. This is just what I have heard so i can neither confirm nor deny the accuracy of the statement. I cannot listen to Sean Godlys chess videos without wanting to take a bite out of my monitor and pull the back pockets from my jeans in frustration. Chess material is dry enough without him freeze drying it in permafrost under a monotone delivery and expressionless dialogue. I understand that people have different tastes though.