Chapter 65 of the Tao Teh Ching talks about rule and measure and Mystical Virtue and Great Harmony.

In the old days, those who were well versed in the practice of the Tao did not try to enlighten the people, but rather to keep them in the state of simplicity. For, why are the people hard to govern? Because they are too clever! Therefore, he who governs his state with cleverness is its malefactor; but he who governs his state without restoring to cleverness is its benefactor. To know these principles is to possess a rule and a measure. To keep the rule and the measure constantly in your mind is what we call Mystical Virtue. Deep and far-reaching is Mystical Virtue! It leads all things to return, till they come back to the Great Harmony.