Chapter 2, Part 23 - Confucius

Tsze-chang asked whether the affairs of ten ages after could be known.

Confucius said, "The Yin dynasty followed the regulations of the Hsia: wherein it took from or added to them may be known. The Chau dynasty has followed the regulations of Yin: wherein it took from or added to them may be known. Some other may follow the Chau, but though it should be at the distance of a hundred ages, its affairs may be known."
~ James Legge translation via The Internet Classics Archive ~

Go here to read the introductory post to this serialized version of the Analects of Confucius.