Mencius - Book 1, Part 1, Chapter 7F

It is said in the Book of Poetry, "His example affected his wife. It reached to his brothers, and his family of the State was governed by it." The language shows how king Wan simply took his kindly heart, and exercised it towards those parties. Therefore the carrying out his kindness of heart by a prince will suffice for the love and protection of all within the four seas, and if he do not carry it out, he will not be able to protect his wife and children. The way in which the ancients came greatly to surpass other men, was no other but this: simply that they knew well how to carry out, so as to affect others, what they themselves did. Now your kindness is sufficient to reach to animals, and no benefits are extended from it to reach the people. How is this? Is an exception to be made here?

'By weighing, we know what things are light, and what heavy. By measuring, we know what things are long, and what short. The relations of all things may be thus determined, and it is of the greatest importance to estimate the motions of the mind. I beg your Majesty to measure it.

'You collect your equipments of war, endanger your soldiers and officers, and excite the resentment of the other princes; do these things cause you pleasure in your mind?'
~ James Legge translation via nothingistic.org ~

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