Mencius - Book 4, Part 1, Chapter 13

Mencius said, 'Po-Î, that he might avoid Châ'u, was dwelling on the coast of the northern sea. When he heard of the rise of king Wan, he roused himself, and said, "Why should I not go and follow him? I have heard that the chief of the West knows well how to nourish the old." T'âi-kung, that he might avoid Châu, was dwelling on the coast of the eastern sea. When he heard of the rise of king Wan, he roused himself, and said, "Why should I not go and follow him? I have heard that the chief of the West knows well how to nourish the old."

'Those two old men were the greatest old men of the kingdom. When they came to follow king Wan, it was the fathers of the kingdom coming to follow him. When the fathers of the kingdom joined him, how could the sons go to any other?

'Were any of the princes to practice the government of king Wan, within seven years he would be sure to be giving laws to the kingdom.'
~ James Legge translation via nothingistic.org ~

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