At first, I thought about how trivial the principles were, which explains why it is part of the high school curriculum in some places. Then, I appreciated the low-key language and practical examples used as the principles were easy to grasp.
Also, I find that many of the principles are now common sense in our day and age. The latter is understandable as the book belongs to a different era. I learned a thing or two—tremendous and easy-to-read text.