Trial: study carefully; Time: the current situation; Degree: estimation and conjecture; Potential: development trend.

Observe and analyze the current situation and estimate the changes of the situation. It means that people's subjective initiative can analyze and use conditions to achieve the best effect of activities.

From Ming Shen Defu's "Wan Liye was compiled and the township test met with water and fire": "Liu wants to finish the ceremony, judge the situation and get to the point." And Hong Rengan's "Senior Minister's New Chapter": "The husband's affairs are constantly changing, and the reason is poor. If the story is not feasible today but can be predetermined, it will be a blessing in the future; What is feasible today, but not fixed, is a disaster later. The reason lies in judging the situation and being strong and weak. "