1. The study of the categorical system of traditional Chinese philosophy has its general and particular significance. Its general significance can be expounded in at least the following three aspects:
First, while the study of the history of philosophy necessarily requires the study of the historical function of philosophers and philosophical schools, the ultimate value of such a study is to reveal the necessary logic that determined the specific development of certain philosophical thinking in history. For instance, what is the necessary logic of the development of the pre-Qin philosophical thinking from Confucius to Mencius to Xunzi? A scientific history of philosophy with Marxism as its guiding thought should reveal not only the developmental causes of philosophical thought but also the inner logic of the growth of such thought. Since philosophy is a science of the most general laws of nature, society and human thought presented in the form of abstractions, the development of the content of philosophical thought is therefore a history of the continuous advancement of concepts and categories and of their continuous clarification, enrichment and growth. We should study how concepts and categories were advanced in the history of philosophy, how their contents became clearer, richer and more systematic, and how the categorical system became more complicated, more comprehensive and more systematic; we should conduct a concrete analysis of the development of concepts and categories. This will enable us to discover the laws governing the development of philosophical thought and reveal its inner logic.
Second, when we say that the history of philosophy is one of the struggle between materialism and idealism we do not mean to imply that this struggle and the development of man's cognition are two separate processes. It was the one and same process through which man's knowledge of the world has been developing in the struggle between material ism and idealism which manifests the law of the development of man's knowledge. As the process of knowledge calls for the use of concepts and categories, every stage of development in the history of philosophy is marked by differing explanations of certain basic concepts and categories out of which emerged materialism and idealism. In the history of Chinese philosophy, for example, the struggle between materialism and idealism before the Qin Dynasty generally centered around the differing explanations of the Heavenly way and the human way, name and content, knowledge and conduct, and the variable and the constant. During the Wei and Jin Dynasties it centered around such pairs of concepts as being and non-being, essence and function, word and idea, ethical code and spontaneity. During the Song and Ming Dynasties it focused on principle and force, mind and matter, mind and nature, subject and object. A study of the development of concepts and categories is a key to the exposure of the law governing the struggle between materialism and idealism.
What is more, this study will enable us to understand the necessity of the emergence of certain concepts and categories in the history of cognition and to overcome the shortcomings of maintaining an oversimplified negative attitude toward idealism which can be found in the past studies of the history of philosophy. Wang Bi was an idealist philosopher, but it was he who advanced some categories such as essence and function, the one and the many, word and idea "which help us recognize and master the focal point in the web of natural phenomena." Despite his incorrect presentation of these categories, his advancement of them marked a step forward in man's knowledge, which deserves recognition for its position in the history of philosophy. Only after Wang Bi first posed the concepts of "taking nonbeing as essence" and "forget the words having grasped the concept" did there appear Ouyang Jian's later theory of "The Word Expresses the Concept" (Yan jin yi Urn) and Pei Wei's "On the Exaltation of Being" (Chong you lun). Therefore the study of the concepts and categories in the history of philosophy and their development constitutes an indispensable link in correctly appraising materialism and idealism in the history of philosophy.
Third, Engels believed that the study of philosophies of the past was the only way to temper one's theoretical thinking. A scientific history of philosophy can certainly play such a role, and a scientific history of man's knowledge essentially would be the history of the development of concepts and categories. Since concepts and categories in the history of philosophy reflect man's deepening knowledge, when we study its development we are rethinking in our own thought the process of man's coming to know the world. Of course we discard the accidental and secondary factors and grasp the essential, normative content. This process of rethinking inevitably deepens our own thought. In our study of the development of concepts and categories, we not only relive the process of mankind using concepts and categories to understand the world, but invariably use certain methods to revisualize them. That method can only be one of making a theoretical analysis of the contents of the concepts and categories and the relationships between them and the logical relationships in their development. Such a process of analysis itself is a kind of theoretical thinking. In this sense, this study can help us improve our ability for theoretical thinking.
2. The above-mentioned three points give only the general significance of studying philosophical concepts and categories, for that significance exists in the study of the history of any philosophy (e.g., the Western or Indian). However, the study of the study of the categories of traditional Chinese philosophy and its history of development has also its particular significance; namely, it will enable us to understand the characteristics and level of development of traditional Chinese philosophy. Western philosophy has its own categorical system; its characteristics and the different levels of development of its philosophical thinking at different historical stages are reflected in the development from Aristotle's Categories to Hegel's Logik. The categories used in the primitive Indian Buddhism and the categories of the Kunya and Bhava sects of Mahaya-na, more or less in succession and each with its striking features, represent the fairly high level Indian Buddhism attained in logical thought and categorical analysis. Traditional Chinese philosophy has its own concepts and categories which gradually formed a fairly comprehensive system. Because of this it will not do just to take them in terms of the concepts and categories of Western philosophy, nor will it do to take them in terms of the Marxist philosophical concepts and categories.
Except for a few concepts taken from Indian Buddhism, the concepts and categories which have taken form in the long history of Chinese philosophy basically developed independently, hence their striking features. For example, the Heavenly way (Tian dao) and the human way (ren dao) as a pair of categories were very important in the history of Chinese philosophy. Therefore traditional Chinese philosophy not only paid considerable attention to the study of the relationship between the Heaven and man, but paid special attention to the study of the relationships between man and man (society). Another example is the pair of categories ti and yong which contain the meanings of not only noumenon and phenomenon, but also base and function, whole and part, and abstract and concrete. Such series of pairs of concepts and categories reflect not only the characteristics of traditional Chinese philosophy, but also the level of theoretical thinking at a certain stage of historical development. To make a not completely apt comparison: traditional Chinese medicine certainly has its own particular tradition with its own particular theoretical system, particular medical terms and concepts. Despite the fact that we have not found clear scientific explanations for some of the theories and achievements, since it does achieve good results in medical treatment it must reflect certain aspects of objective reality and contain fairly profound truths. Since concepts and categories are necessary conditions for the formation of knowledge and play a pivotal role in linking the subjective to the objective, definite concepts and categories reflect definite achievements made by man in recognizing certain aspects of objective reality through his theoretical practice; hence, different concepts and categories mark different depths of man's cognition. Therefore, when we study the concepts and categories at different stages of the development of traditional Chinese philosophy, we can see the level of theoretical thinking at the different stages of development of Chinese history.
In the history of Chinese philosophy, there are three periods during which schools made major contributions to the formation of the categorical system of traditional Chinese philosophy, namely, the various pre-Qin schools, the metaphysical school (Xuanxue) of the Wei and Jin, and the Neo-Confucianism (Lixue) of the Song and Ming Dynasties. When we compare the categorical system of traditional Chinese philosophy in the three stages with those of the Western philosophy, we are impressed by its distinct features and fairly high level. This comparison between the categorical system of traditional Chinese philosophy and those of other countries, nations and regions constitutes an important subject in comparative philosophy.
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