分久必合，合久必分
fēn jiǔ bì hé , hé jiǔ bì fēn

Translation

  • lit. that which is long divided must unify, and that which is long unified must divide (idiom, from 三國演義|三国演义[San1 guo2 Yan3 yi4])
  • fig. things are constantly changing
Chinese Tones