I've heard stories about that 1,200 page behemoth. It is the authority on the subject, and it also makes an excellent platform to boost yourself to change a light-bulb. If you drive a truck, you can throw a copy in the back to improve your traction in the winter when the roads get icy. :-) Another excellent work on the same topic is A.W. Tozer's "Knowledge of the Holy." And at a mere 120 pages, you actually stand a chance of finishing it before going blind. :-) It's small but dense. I highly recommend it for every Christian.