Random Thoughts about "中庸"--The Doctrine of Mean

"喜怒哀乐之未发，谓之中；
发而皆中节，谓之和；
中也者，天下之大本也；
和也者，天下之达道也。
致中和，天地位焉，万物育焉。"

When joy, anger, sorrow and pleasure have not yet arisen, it is called zhong (equilibrium, centrality, mean).
When they arise to their appropriate levels, it is called "harmony."
Zhong is the great root of all-under-heaven.
"Harmony" is the penetration of the Dao through all-under-heaven.
When the mean and harmony are actualized, Heaven and Earth are in their proper positions, and the myriad things are nourished.
(http://www.hm.tyg.jp/~acmuller/contao/docofmean.htm)

I was reading my text book last night. Man needs self-efficacy. and at the same time, he can't leave social network and social supports. 中庸"The Doctrine of Mean" jamped into my mind.

Human can only comprehend certain frequents of waves, which are in the middle of all frequents of waves.
Human likes certain weather, not too hot, nor too cold; not too dry, nor too wet.
Human likes certain body shapes, not too fat, nor too thin.
......


It seems like "the Doctrine of Mean" holds certain levels of truth.
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