Major Chinese religio-philosophical tradition. Though the concept of dao was employed by all Chinese schools of thought, Daoism arose out of the promotion of dao as the social ideal. Laozi is traditionally regarded as the founder of Daoism and the author of its classic text, the Daodejing . Other Daoist classics include the Zhuangzi (4th–3rd century BC; ) and the Liezi. In Daoism, dao is the force or principle about which nothing can be predicated, but that latently contains the forms, entities, and forces of all phenomena. This natural wisdom should not be interfered with; de, or superior virtue, is acquired through action so entirely in accordance with the natural order that its author leaves no trace of himself in his work. The tradition holds that all beings and things are fundamentally one. Daoism's focus on nature and the natural order complements the societal focus of Confucianism, and its synthesis with Buddhism is the basis of Zen. See alsoyin-yang.