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Dao, the fundamental principle of the world, the ultimate of life and death of everything in the universe, is composed of the constant working of Yin and Yang, which represent the two contrary powers of the world. The goodness is the actions that help continuing the Dao, the principle of Yin and Yang; and the principle of morality means to achieve the own nature of everything. The ones who understand this is able to know the meaning of Ren (the goodness), and the ones who experience this is considered to be wise men. The principle of Dao is widely accepted and used in daily life, but the people who use it mostly know nothing about it. Therefore, the principle of Dao contains everything and acts as the ultimate root, but few people know about it. I-ching shows that the principle of Dao is practical, though it seems hidden inside. How perfect it is that we can promote the vitality of the world and share the thought with the greatest men who don’t actually manage the world as a king, establishing a monument of morality, achieving great exploits! The greatest achievement ranges from learning the moral integrity to realizing the satisfaction of everything in the world with daily updates, which also sufficiently shows the illumination of morality. Yi (changes) in I-ching means keeping changing and going forward. Qian (the 1^st Yao in I-ching) means achievement and a static phenomenon, and Kun (the 2^nd Yao in I-ching) means implementation and emulation. To calculate the changes in the future is called Zhan (anticipation), in which way to understand thoroughly about the principle of changing is called Shi (things). When the anticipation reaches a top level, with highest proficiency in using Yin and Yang, one is able to know the secret of the God, and this is called Shen (as almighty as the God).