太玄 易傳 陰陽消息 過程論 厚薄相劘 物極則反 時中 因革相成 Taixuan Yizhuan The theory of the growth and decline of Yin and Yang Thinking of in-the-process Interaction between and weighty Yin and ethereal Yang Theory of things going into their opposites after becoming too extreme Do the right all the time Complementation between following the old things while modifying them