The Yellow Emperor's Inner Canon says: The sages of ancient times taught people to avoid harmful influences and seasonal winds at the proper times. With a tranquil and empty mind, one's true qi will flow freely, the spirit will remain within, and illness will have no way to arise. Thus, one's ambitions remain calm and one's desires few; the heart is at peace and unafraid; the body may labor without growing weary. The qi flows smoothly, and everyone follows their wishes and gets what they want. They enjoy their food, are content with their clothes, take pleasure in their customs, and do not envy those above or below them. Their people are therefore simple and unspoiled. Their appetites cannot overwork their eyes, nor can depravity confuse their hearts. Whether foolish or wise, worthy or unworthy, they fear nothing in the world, and thus they accord with the Way.
