The term "yijian" in the Yi zhuan represents the basic characteristics of Qian and Kun. Yi symbolizes the ever-changing power of Qian in time, while jian represents Kun's quiet obedience in space. Understanding yijian is crucial for grasping the Way of Heaven. Many philosophers, like XIONG Shi-li and Schopenhauer, have explored the concept of binary opposites in the universe and society.