一分为三是人类认识世界的最普遍的规律。一分为二是一分为三的特殊表现形式。一分为三是一分为多的一般表现形式。认识应该包含着矛盾着的三个方面 ,即是“认识的主体———认识的中介———认识的客体”。主体通过中介来认识客体。“一”与“三”的关系概括为三种不同的表达形式 :“一生二 ,二生三”式 ;“天人合一”或对立统一式 ;“一而三 ,三而一”式。“一”与“三”可以是真实的绝对的存在 ,也可以是虚有的相对的存在 ,还可以是亦实亦虚的存在状态。“一”与“三”的关系 ,可以是直线关系 ;也可以是平面的关系 ;还可以是立体的关系。(AA—Aa—aa) n可以作为一分为三之模式来解释事物的存在及其相互关系。一分为三有着自我独具的范畴。运用一分为三 ,对事物的认识可以表示为“过份———中庸 (适度 )———不及”。中庸形态有四种或六种表示方式。庞朴先生“凭借两端认识中间”的中庸四态、否定用“中间”表示中庸和用ABC分别表示三者及其相互之间关系的认识 ,值得商榷和修正 Dividing into three is the most common rule that mankind knows about the world. Divided into two is divided into three special manifestations. Dividing one into three is a general expression of oneness. Knowledge should contain the contradictions of the three aspects, namely, “the subject of knowledge --- the agent of knowledge --- the object of knowledge.” The subject knows the object through the intermediary. The relationship between “one” and “three” can be summed up in three different forms of expression: “one life two, two three life”; “harmony between man and nature” or opposites; “one three, three and one”. “One” and “three” can be true and absolute existence, can also be relative existence, can also be true and false existence. The relationship between “one” and “three” can be a straight line relationship, a plane relationship, or a three-dimensional relationship. (AA-Aa-aa) n can explain the existence and interrelationship of things as a three-part model. Divided into three have their own unique category. The use of one in three, the understanding of things can be expressed as “excessive - moderation (moderate) - less than.” There are four or six modes of expression of moderation. Mr. Pang Park’s understanding of “using the mediocre understanding of the middle between both ends” and “denying the middle” and “using the middle” to express the three and their relations with each other respectively is worth discussing and correcting