| Parmenides created a philosophical tradition of metaphysics, the world is divided into two sections: one for existence, the other for non-existence. He believes that philosophy should study the world of existence. Plato inherited this tradition. He also insists that philosophy should pay attention to the world of existence, that is the idea of the world. But Plato did not abandon the world of views; he made his attempt to the specific reality of the existence of a reasonable explanation. He believes the concrete reality of existence is based on the model of the idea of the world, and they partake and imitate the idea. As a deontological point mainly held early in Plato's theory, things as themselves tend to trend in an absolutely perfect idea, the idea is good. Plato here, good is the highest idea. It is like the real world, like the sun has the dual function of ontology and epistemology. Therefore, it takes Plato's idea as a valuable hierarchy series. They rely on good idea and direct for it. This is Plato's idea of a valuable and ethical facet, those who own performance as ugly, evil things, cannot partake the idea. But from the ontological point of view, everything has the value and significance of its existence, whether it is good or bad, beautiful or ugly. If they exist, as existence there are the same. Since we recognize the beautiful idea, we should also recognize the ugly idea. This is a preliminary defect of deontology early in Plato's theory. In addition, how to understand the existence of ideas and specific matters is a problem, there are many contradictions in the theory of partaking. In the latter part of the conditions, Plato makes the transformation of the original theory in the condition of persisting the theory of ideas. He tried to make the various ideas putting together by deducing between ideas; the most important is the "existence" and "non-existence" to communicate with each other. In doing so, he is unsuccessful, because once the "non-existence" is extracted; it is an abstract concept and idea. The integration and linkage between these areas and the sector as a whole is still a matter of external relations, the two world's problem is unresolved.Aristotle studied Plato's theory for years and he has a very good understanding of Plato's theory of ideas, and he is also fully aware of Plato's theory of the problem lies. Aimed at theory of ideas, Aristotle proposed entities. His entities develop Plato's idea of reality; entity is the reality of the idea. He thought that Plato's theory of ideas increasingly detached from the reality, and is far from the perceptual world. His "entity" is to emphasize and develop the real facet of idea. It draws idea from heaven to earth. In metaphysics, Aristotle thought philosophy should take "being qua being" as a research subject. This is overall and general sense of existence. The existence of this kind must be shown to exist, it can own achievements. In the beginning of Chapter VI of the metaphysics, Aristotle proposes four kinds of existence: the existence of accidental attributes, the existence of truth and false, the existence of categories, the existence of potential and the reality. In these four kinds of existence, categories are the essence of existence. Entity is, therefore, the significance of categories. However, how to understand entity is different, some people think that the theory of entity in Categories resumes the tradition of early Greek natural philosophy. And the theory of entity in Metaphysics inherits the tradition of Plato's philosophy, and there is a contradiction. In this paper, based on the Categories that the entity in Metaphysics is the launch of the entity in Categories. It is decomposition and analysis of individual things for the results, and the reason for the existence of the principle of individual things. It is included in the original land among individual things, and cannot be divorced from the individual things. Entity is a "whole", an overall thing, but also a specific nature. Later philosophers develop entities as a result of one-side of form and essence, abstracting God, Soul and the World. These things as transcendental things totally unrelated to reality, they are purely abstract. In doing so, they will no longer realistic, is a totally ideals. But philosophy is not merely the desire to meet its ideals of the other side of the world, it pursuits ideals, but always want to realize ideals. Therefore, the philosophy should be the ultimate form of the realization of a concrete reality and rich content.Kant was unsatisfied with the transcendental entities and categories of the understanding, his entities and categories were based on the identified of the perceptual experience. But he makes form or essence contained in entity separated from it and resolves it in the Critique of Practical Reason, it still makes the entity itself as a "whole" and to the whole divided. He has been in the Critique of Practical Reason is still an abstract and one-sidedness. He also attempted to overcome the abstract and one-sidedness in the Critique of Judgment. Hegel inherited the tradition of Aristotle's philosophy, while the absorption of Modern Philosophy"subject", regarded philosophy built on the concept level, through its own concept of a logical development of its own success. In Hegel here, as a self-concept is universal, is unique, individuality, and, end up as "individual" to the highest link. Hegel achieves Aristotle's entity self-contained with the specific content of the rich at a higher level. Husserl created a phenomenological philosophical road. He stresses "intellectual intuition", which has the bud in Aristotle's entities. Entity is "revealed the nature", still is a specific character. Heidegger inherited the method of Husserl's phenomenology, but there is a natural relevance with Aristotle's philosophy. He reveals the existence of the implementation of the "Dasein", and that "Dasein" is itself a realistic, specific person. It is the timing horizon, "Da" for "Dasein" is itself a restrictive provision, and it is finite and the infinite tension in a relationship. Through the above, we can see that although the going is different from Kant to Heidegger's philosophical road, but they question the fundamental philosophy and the way to solve the problem associated with the Aristotle greatly. |