Eastern philosophy
The "Dao De Jing" ("Tao-Te-Ching," c. 4th century BCE), traditionally attributed to Laozi, and the "Nan Hua Jing" ("Zhuang Zi") are considered the key texts of the tradition. The first organized form of Taoism, the Tianshi (Celestial Masters') school arose in the 2nd century CE. Xuanxue ("deep learning", also "Neo-Taoism") was a major philosophical movement influenced by Confucian scholarship, which focused on the interpretation of the "Yijing," "Daodejing," and "Zhuangzi" and which flourished during the third to sixth centuries CE. The most important philosophers of this movement were He Yan, Wang Bi, the Seven Sages of the Bamboo Grove, Ge Hong and Guo Xiang. Thinkers like He Yan and Wang Bi focused on the deep nature of Tao, which they saw as being best exemplified by the term "Wu" (nothingness, non-being, negativity).
Eastern philosophy
Some Western thinkers claim that philosophy as such is only characteristic of Western cultures. The German philosopher Martin Heidegger is even reported to have said that only Greek and German languages are suitable for philosophizing. It is still commonplace in Western universities to teach only Western philosophy and to ignore Asian philosophy altogether, or consider only newer Western-influenced Asian thought proper "philosophy". Carine Defoort, herself a specialist in Chinese thought, has offered support for such a "family" view of philosophy, while Rein Raud has presented an argument against it and offered a more flexible definition of philosophy that would include both Western and Asian thought on equal terms. In response, Ouyang Min argues that philosophy proper is a Western cultural practice and essentially different from "zhexue", which is what the Chinese have, even though "zhexue" (originally "tetsugaku") is actually a neologism coined in 1873 by Nishi Amane for describing Western philosophy as opposed to traditional Asian thought.