He who attains to the sovereignty of the kingdom, having those three important things, shall be able to effect that there shall be few errors under his government.Go here to read the introductory post to this serialized version of the Doctrine of the Mean.
However excellent may have been the regulations of those of former times, they cannot be attested. Not being attested, they cannot command credence, and not being credited, the people would not follow them. However excellent might be the regulations made by one in an inferior situation, he is not in a position to be honored. Unhonored, he cannot command credence, and not being credited, the people would not follow his rules.
Therefore the institutions of the Ruler are rooted in his own character and conduct, and sufficient attestation of them is given by the masses of the people. He examines them by comparison with those of the three kings, and finds them without mistake. He sets them up before Heaven and Earth, and finds nothing in them contrary to their mode of operation. He presents himself with them before spiritual beings, and no doubts about them arise. He is prepared to wait for the rise of a sage a hundred ages after, and has no misgivings.
~ James Legge translation via nothingistic.org ~