wu wei

Wu wei (Traditional Chinese characters: 無為 Simplified Chinese characters: 无为) is an important tenet of Taoism that involves knowing when to act and when not to act. Wu may be translated as not have; Wei may be translated as do, act, serve as, govern. The literal meaning of Wu Wei is "without action" and is often included in the paradox wei wu wei : "action without action" or "effortless doing". The practice of wu wei and the efficacy of wei wu wei are fundamental tenets in Chinese thought and have been mostly emphasized by the Taoist school. The aim of wu wei is to achieve a state of perfect equilibrium, or alignment with the Tao, and, as a result, obtain an irresistible form of "soft and invisible" power. In Zen Calligraphy, Wu Wei has been represented as a circle.
See more at Wikipedia.org...

Wu Wei (Chinese) Inaction, inactivity; quiescence, placidity. Used in Taoism in relation to the tao of man, the idea being that "Heaven is emptiness" and by practicing wu wei (inaction) and becoming "empty" one becomes at one with heaven or tao. Reminiscent of the highly mystical import of the Buddhist sunyata (Sanskrit, "emptiness," "void"). In all such words the difficulty is in finding ordinary language to convey the thought. There is not an absolutely empty point of space in all infinitude; what seems to the human senses to be cosmic vacuity is actually complete or absolute fullness, a pleroma as the Gnostics said. Cosmic sunyata or wu wei is emptiness simply because it lacks the lowest forms of matter -- forms and bodies which are like the spume or bubbles on the sea of cosmic reality, which to human senses is empty because invisible, intangible, and not subject to sense perception.