Well, I'm open to persuasion. For instance: another recommendation in the book is that you code in commented paragraphs, but limit those comments to a single line. Doing that will cause me some difficulty, as I occasionally write a paragraph that sacrifices some clarity for the sake of speed of execution, then compensate for the opacity of the code by overcommenting.
Damian suggests that if you require more than one line to summarize a paragraph of code, you probably need to refactor it. From here on out, I will be thinking about that every time I find it challenging to summarize within a single line. It's a stylistic constraint, but it has architectural ramifications. Thought-provoking stuff!