Mencius - Book 1, Part 2, Chapter 16A

The duke P'ing of Lû was about to leave his palace, when his favorite, one Tsang Ts'ang, made a request to him, saying, 'On other days, when you have gone out, you have given instructions to the officers as to where you were going. But now, the horses have been put to the carriage, and the officers do not yet know where you are going. I venture to ask.'

The duke said, 'I am going to see the scholar Mang.' 'How is this?' said the other. 'That you demean yourself, prince, in paying the honor of the first visit to a common man, is, I suppose, because you think that he is a man of talents and virtue. By such men the rules of ceremonial proprieties and right are observed. But on the occasion of this Mang's second mourning, his observances exceeded those of the former. Do not go to see him, my prince.' The duke said, 'I will not.'
~ James Legge translation via nothingistic.org ~

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