Mencius - Book 3, Part 1, Chapter 3D

The duke afterwards sent Pî Chan to consult Mencius about the nine-squares system of dividing the land. Mencius said to him, 'Since your prince, wishing to put in practice a benevolent government, has made choice of you and put you into this employment, you must exert yourself to the utmost. Now, the first thing towards a benevolent government must be to lay down the boundaries. If the boundaries be not defined correctly, the division of the land into squares will not be equal, and the produce available for salaries will not be evenly distributed.

'On this account, oppressive rulers and impure ministers are sure to neglect this defining of the boundaries. When the boundaries have been defined correctly, the division of the fields and the regulation of allowances may be determined by you, sitting at your ease.

'Although the territory of T'Ang is narrow and small, yet there must be in it men of a superior grade, and there must be in it country-men. If there were not men of a superior grade, there would be none to rule the country-men. If there were not country-men, there would be none to support the men of superior grade.
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.