> In my experience the parts of a (study) book where you feel dumb and frustrated while reading are generally the best parts. True, but not always. Just as oft

> In my experience the parts of a (study) book where you feel dumb and frustrated while reading are generally the best parts. True, but not always. Just as often, such parts are terribly written for one or the reason. It's possible that particular section of text is the least favorite of the author so they rush through it. Another possibility is that the author gets tired by the time that section rolls around and just goes thru the motions. Or that the author plain doesn't think a certain section is important enough to expound on it carefully. Yet another possibility is that the author is not universally well-versed in the subject they are writing about: they know some parts better than others.