Mencius said, 'A sage is the teacher of a hundred generations: this is true of Po-î and Hûi of Liû-Hsiâ. Therefore when men now bear the character of Po-î, the corrupt become pure, and the weak acquire determination. When they hear the character of Hûi of Liû-Hsiâ, the mean become generous, and the niggardly become liberal. Those two made themselves distinguished a hundred generations ago, and after a hundred generations, those who hear of them, are all aroused in this manner. Could such effects be produced by them, if they had not been sages? And how much more did they affect those who were in contiguity with them, and felt their inspiring influence!'~ James Legge translation via nothingistic.org ~
Go here to read the introductory post to this serialized version of the Works of Mencius.