Gui Guzi’s three most incisive sentences are either open to show, or closed and closed. If things happen and are reversed, it is the intention of the sage, and we must not ignore it. Instead, we use it to understand the past, and we use it to understand the present.

1. Either open to show it, or close it.

The general idea: Either disclose your true situation and tell the other party, or hide your true situation.

Disclosing one's true situation is to gain the trust of the other party, while hiding one's true situation is to test the sincerity of the other party. You may be a little confused at this point, wondering whether you should tell others or not. It's actually very simple. Different situations require different methods, and you have to be flexible. Understand what works and what doesn’t.

2. If something happens and is reversed, it is the intention of the sage, and we must not ignore it.

The general idea: Everything requires us to study and examine it repeatedly, so that we can fully understand it. This is what the saints teach us, and we must not fail to study it carefully.

The spirit is found in the details, or details determine everything. Many times, often because we don’t pay attention to details, the results can be imagined.

3. Reverse to understand the past and reverse to understand the present.

The general idea: Look back at the past and examine the present.

There was a very famous emperor in the Tang Dynasty who once said: "Using copper as a mirror, you can straighten your clothes; using ancient times as a mirror, you can know the rise and fall; using people as a mirror, you can know gains and losses." Why we look at history is to check the present. If something happens that is inconsistent with today, we can review history and find the experience of the ancients, so that we can solve the problem more easily.

Guiguzi:

The Wang family, named Xu, also known as Zen, his birth and death years are unknown, also known as Wangxu, Wangchan, Wangli, Taoist name Guiguzi. A native of the Chu state during the Spring and Autumn Period and the Warring States Period, his ancestral home was south of Chaoge City. A legendary figure from the Warring States Period. The famous strategist, the originator of political strategists, the master of military art, and the founder of the political strategists of hundreds of schools of thought. According to legend, the four moles on his forehead turned into ghosts. He is proficient in hundreds of schools of knowledge. Because he lives in seclusion in Guigu, Yunmeng Mountain, he calls himself Mr. Guigu.