In the face of a huge and complex world, people must not only understand the whole, but also have to classify and understand, in order to treat it more appropriately, which is the key to the difficulty of life.

Dividing the world is of great significance, and for thousands of years, how to divide the world has been a difficult problem. In this day and age, the division of the world into "natural, social and personal" methods is still the mainstream of dividing the world. But this division is clearly imprecise and repetitive, because both "nature" and "society" contain "individuals."
With the individual as the center, the Fujia Doctrine divides the world into three parts of "external objects, outsiders and oneself", which are essentially different and clearly demarcated, and this division is most meaningful.
Note: Here, "thing" refers to an objective reality other than man.
First, foreign objects: only objects
The so-called "external things", that is, things outside the body, are everything outside of themselves. The world is "only physical", while foreign objects are "only objects". Small objects form large objects, thus forming a vast world of foreign objects. Foreign objects can be roughly divided into two categories, living and non-living, and carry out a variety of "object movements".
Outsiders: only groups
The so-called "outsider", that is, the person outside the body, is all people outside the self. The world is "only the body", and the outsider is "only the group". Small groups form large groups, thus forming a complex world of outsiders. Outsiders carry out a variety of "benefit activities", with goals, division of labor, and distribution.
Third, the self: only the human body
People know the world, but they also know themselves. The world is "only the body", and the self is "only the human body". The "human body" is a living whole, and all kinds of "life activities" are carried out at all times, with wishes, things, practices, and processes.
In the three-part world of the "Fu Jia Theory", people must not only know foreign objects and outsiders, but also know themselves. In particular, knowing one's own "true wishes in life, real events in life, life practice and life process" enables people to know the principles of life, so that people can know the subsequent life process, so that life has a basis.
The original author of this article: Huo Shuangwu