In the words of the author:
The message at the heart of this book is that the feelings of knowing, correctness, conviction, and certainty aren't deliberate conclusions and conscious choices. They are mental sensations that happen to us.
Unfortunately, once one understands this point, the rest of the book is rather less inspiring than promised. Although the discussions concerning the neural basis of experience is well-written, once the author turns to more speculative areas such as evolutionary psychology, religion, or epistemology his arguments rapidly display a lack of rigor and understanding of the fields.