Tzu-Jan Chinese philosophy
(Chinese: “naturalness”), in Chinese Taoism, an ideal state of human existence that results from living in complete harmony with the forces of nature. Taoists, observing that everything in the world has its natural state, strive to attain a state of complete spontaneity in order to become what nature intended them to be. As a consequence, life becomes exceedingly simple; and such things as life and death, good health and illness are accepted as part of the irresistible cycle of nature, which ceaselessly makes and unmakes the world. Unlike the rest of the universe, however, man must resolve to bring his existence into conformity with the forces of nature. He can do this best by first observing the ever-changing world about him and then “fatalistically” abstaining from struggle against powers beyond his control.
From Encyclopedia Britannica
Spontaneity; unconditioned and totally itself. The Tao is characterized by tzu-jan.
The Tao is further characterized by tzu-jan, which is difficult to translate directly but is usually rendered "spontaneity" or "self-so." The self-so is unconditioned and uninfluenced; it is nothing other than itself.
This, in turn, is the ideal of the sage-ruler in the Tao Te Ching. He does not strive, he does not intervene, but acts in such a way that "everyone throughout the country says, 'It happened of its own accord' (tzu-jan)."