The first 6 chapters/lessons are mostly physics but the last chapter (7th lesson) is geared towards his philosophy. As a matter of fact, the last chapter is the longest with almost 17 pages which is mainly about the nature of consciousness, probably the least understood subject; and as a result, this last lesson is more like speculation or inspiration rather than any substantial answer. Even including the four index pages, the book has a total of only 86 pages and one can imagine finishing reading it in a couple hours or so.
When the author says "physics", he mostly means "elementary particle physics" and "cosmology/astrophysics", which is so typical of particle physicists :-) The book has practically nothing about other branches of physics ("condensed matter physics" etc.). Of course, quantum mechanics or/and relativity are needed in virtually all branches of physics.
I quickly and comfortably read through the early chapters without any sort of rumination, as I'm familiar with the subjects. At least, one of the English translators is a poet himself and I wonder whether this has helped make the translated version read better. In the 5th lesson though, the author chooses to discuss the "loop quantum gravity" as the theory beyond the current Standard Model and the attempt to reconcile quantum mechanics and general relativity. This is not too surprising as he's said to be one of the founders of the loop quantum gravity theory. Here, I have felt like learning something about the "loop quantum gravity" again and it's always great to see how the "real experts" explain a difficult theory to laymen.
In the 6th lesson, the author skilfully avoid using the word "entropy" but he uses "heat" (that everybody probably has some idea about) to relate to the flow of time: "The difference between past and future exists only when there is heat." (p.53/lines 13-14). I immediately remember Sean Carroll's book trying to explain why time only moves forwards but not backward. I guess, since entropy ~ heat/(absolute-temperature) at least in thermodynamics, this is a good way to avoid unnecessary sophistication. Hmm ......Continua