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).
Ruhollah Khomeini
Khomeini studied Greek philosophy and was influenced by both the philosophy of Aristotle, whom he regarded as the founder of logic, and Plato, whose views "in the field of divinity" he regarded as "grave and solid". Among Islamic philosophers, Khomeini was mainly influenced by Avicenna and Mulla Sadra.
Apart from philosophy, Khomeini was interested in literature and poetry. His poetry collection was released after his death. Beginning in his adolescent years, Khomeini composed mystic, political and social poetry. His poetry works were published in three collections: "The Confidant," "The Decanter of Love and Turning Point", and "Divan". His knowledge of poetry is further attested by the modern poet Nader Naderpour (1929–2000), who "had spent many hours exchanging poems with Khomeini in the early 1960". Naderpour remembered: "For four hours we recited poetry. Every single line I recited from any poet, he recited the next."