歷來文人書畫家，多崇道尚藝，由藝入道，妙契自然，顯然受到老莊思想中「自然」母題之影響，成爲極重要的思想基礎。 先秦時期，老子明確地提出「自然」的概念，以哲學思維說明大自然，深刻闡明了宇宙本體存在的狀態與天地萬物形成的過程，莊子承襲其思想，至魏晉南北朝，「自然」一詞從哲學概念漸漸濡化成具美學涵蘊，就書法範疇而論，契入自然，濡化爲書道。 此文係以「自然」爲母題，分別從漢朝蔡邕（133-192年）至唐朝陸羽（733-804年）六百多年來書論逐一作系統論證，就多面向視野歸納、概括衍化出：取象譬意、心手妙契、無爲創作、審美特質、評騭品第及先天資質等之論述。

Influenced by the philosophy of Dao School, most ancient artists, through creating artworks, developed themselves to a status of “being free naturally”; this thoughts of Laozi and of Zhuang not only embodied the artworks but also became a important foundation in art creating. Laozi and Zhuang clearly defined the thoughts and concept of “being free naturally” to explain how the University works. It is till Wei Jen Period, the phrase “freedom” gradually transformed itself from a Laozi Philosophy note into a concept of Aesthetic. To a certain degree, the calligraphy art had combined the Freedom thinking. By using “freedom” as a theme for this text, the author tries to systematically prove the calligraphy theory in the time scale of 600 years, from Cai Yong in Han Dynasty (AC133-192) to Lu Yu in Tang Dynasty (AC733-804), summing up the conclusions: Culvert purpose from nature body、Artistic technique with psychology combination、Unconscious creation behavior、Critics to Calligraphy、Characteristics of Calligraphy Appreciating and qualification that a person innately possesses.