Theory of Yin-yang is an ancient philosophical concept used in traditional Chinese medicine for indicating various antitheses in anatomy, physiology, pathology, diagnosis and treatment, and for explaining the health and disease processes.
What is Yin & Yang?
Yin and Yang are two fundamental principles or properties in the universe, ever opposing and complementing each other, the ceaseless motion of which gives rise to all the changes in the world.
This Symbol (Yin-Yang) represents the ancient Chinese understanding of how things work. The outer circle represents “everything”, while the black and white shapes within the circle represent the interaction of two energies, called “yin” (black) and “yang” (white), which cause everything to happen. They are not completely black or white, just as things in life are not completely black or white, and they cannot exist without each other.
The yin and yang represent all the opposite principles one finds in the universe. Under yang are the principles of maleness, the sun, creation, heat, light, heaven, dominance, and so on, and under yin are the principles of femaleness, the moon, completion, cold, darkness, material forms, submission, and so on. All the opposites one perceives in the universe can be reduced to one of the opposite forces.
The shape of the yin and yang sections of the symbol, actually gives you a sense of the continual movement of these two energies, yin to yang and yang to yin, causing everything to happen: just as things expand and contract, and temperature changes from hot to cold.
This production of yin from yang and yang from yin occurs cyclically and constantly, so that no one principle continually dominates the other or determines the other. All opposites that one experiences—health and sickness, wealth and poverty, power and submission—can be explained in reference to the temporary dominance of one principle over the other. Since no one principle dominates eternally, that means that all conditions are subject to change into their opposites.
This cyclical nature of yin and yang, the opposing forces of change in the universe, mean several things. First all phenomena change into their opposites in an eternal cycle of reversal. Second, since the one principle produces the other, all phenomena have within them the seeds of their opposite state, that is, sickness has the seeds of health, health contains the seeds of sickness, wealth contains the seeds of poverty, etc. Third, even though an opposite may not be seen to be present, since one principle produces the other, no phenomenon is completely devoid of its opposite state. One is never really healthy since health contains the principle of its opposite, sickness. This is called “presence in absence”.
by Xiao Xiao @ InteractChina.com
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