The Master said, "Let a man who is ignorant be fond of using his own judgment; let a man without rank be fond of assuming a directing power to himself; let a man who is living in the present age go back to the ways of antiquity; on the persons of all who act thus calamities will be sure to come."Go here to read the introductory post to this serialized version of the Doctrine of the Mean.
To no one but the Son of Heaven does it belong to order ceremonies, to fix the measures, and to determine the written characters.
Now over the kingdom, carriages have all wheels, of the-same size; all writing is with the same characters; and for conduct there are the same rules.
One may occupy the throne, but if he have not the proper virtue, he may not dare to make ceremonies or music. One may have the virtue, but if he do not occupy the throne, he may not presume to make ceremonies or music.
The Master said, "I may describe the ceremonies of the Hsiâ dynasty, but Chî cannot sufficiently attest my words. I have learned the ceremonies of the Yin dynasty, and in Sung they still continue. I have learned the ceremonies of Châu, which are now used, and I follow Châu."
~ James Legge translation via nothingistic.org ~