But the direction and emphasis are completely different. "Heavenly Descending Marrow" is a good book and a classic. "Tian Tian Mu" emphasizes the cycle of the five elements, which is the most important trend. But there is a feeling that cannot be understood in words. This book has a simple feeling. Very impressive. However, I think this book needs considerable knowledge to understand.
So from time to time, I can still see people saying that this book is a bad book, perhaps because of the lack of foundation, so naturally I can't understand it. In fact, this book is very simple, and the requirements for readers are not very high. It's just that different levels will have different understandings of this book. It may be that the level is low and the understanding is not in place. But as long as you look carefully, I think you can understand something. Poor Bao Tongjian focuses on the collocation and circulation of the five elements, with different emphasis. The key to poor Bao Tongjian is the collocation of five elements.
And not only the five elements, but also the specific heavenly stems and earthly branches in most cases. For example, many times, you don't write "want fire", but write "want fire" specifically. At other times, if you want Ding Huo, you don't write fire, but Ding Huo. The division is very detailed and reasonable. In addition, Poor Bamboo Slips pays great attention to tone, and the expression and usage of tone should be the earliest and widely used in Poor Bamboo Slips. This collocation and use of heavenly stems and earthly branches should be the first in this book. Comparatively speaking, these two books are both classics. However, each has its own tendency, and the novel "Tianjing Drip" focuses on the simplicity of the avenue and captures the true meaning of the five-element cycle. The poor sword focuses on the concrete collocation of the five elements. As for the regulation of climate, it can actually be classified into the collocation of five elements, which can be regarded as an important branch.