Sometimes we don't give ourselves enough credit. When I was reading Kant's "Critique of Pure Reason" earlier this year, I encountered multiple instances where I felt he was contradicting himself or his use of vocabulary was changing so that my understanding of his meaning was off. I made the assumption that I was just not bright enough or educated enough to fully grasp the genius of this seminal work so often cited as one of the most important books in philosophy. I allowed the reputation of the book to intimidate me into not using my own critical faculties to the best of my ability.
But Norman Kemp Smith's Commentary made me feel a little better. Here, he meticulously evaluates almost every line for inconsistencies, and it turns out that I was right in many ways. Kant was making up a whole new system, and inventing nomenclature as he went along, and sometimes you can see the development of his own thought as he changes what his assumptions are behind the meaning of his words. For example, he was the first to give "transcendental" and "transcendent" different meanings, even though in the writings of medieval philosophers these words were used interchangeably.
The translator didn't help matters either. It turns out that when you switch the position of words from the German original into an English sentence, the whole meaning of the phrase changes. What a reader of English may see is not what Kant intended to mean.
Therefore, Kemp Smith makes it clear just how unclear Kant's book can be. It is a difficult work not just because of it's new intellectual ground and content, but because Kant and his translators sometimes were careless.
However, the author is not here to simply bash Kant's book. His diligent analysis helps the reader of Kant to trace the history and unfolding of his thinking, to understand where to take Kant at face value and where to recognize a contradiction that will be corrected later. His overall advice? When Kant says something in one part of the book, just go with it. He means what he says at the time. When you start to feel confused because it seems he is using terminology differently or contradicting himself, make a note of it and move on. Don't sit there and reread the same sentence over and over thinking you've missed something. It will all come out in the end.
Kemp Smith's Commentary really should be read alongside the Critique if you want a really good understanding from your study of Kant's work. It is a true companion piece. The end result is almost twice as long as Kant's original volume, and perhaps one would think that you could simply forgo the Critique altogether and just read the Kemp analysis. But you will quickly see that this is impossible, as the Commentary is not presented as a cohesive standalone narrative, but rather a series of references to various definitions, paragraphs, and sections of the Critique, almost like a separate volume of footnotes.
So for students of philosophy, I definitely recommend reading the Commentary simultaneously with the Critique. It will certainly prolong the time and effort into your reading, but it will ultimately save you from being left with an inaccurate or incomplete understanding of the Critique if you go through the heartache of reading it solo. You'll get more value for your study.
Don't get me wrong, this book will not simplify Kant in any way for you. If anything, it will take you further down the rabbit hole. You can spend years on just studying the Critique and the Commentary alone. So this is not casual reading, folks. I only recommend this highly if you are willing to take the time to truly appreciate Kant as a great and revolutionary thinker, and to further your exploration of how his contributions to metaphysics have changed the discipline and the world to the present day.