分久必合，合久必分 [－－－－－－－－－]

Jyutping fan1 gau2 bit1 hap6 ， hap6 gau2 bit1 fan1
Pinyin fēn jiǔ bì hé ， hé jiǔ bì fēn

Definitions (Wiktionary)
  1. proverb, literally
    That which is long divided must unify; that which is long unified must divide.
  2. proverb, figuratively
    worldly affairs are constantly changing

分久必合，合久必分 [－－－－－－－－－]

Jyutping fan1 gau2 bit1 hap6, hap6 gau2 bit1 fan1
Pinyin fēn jiǔ bì hé , hé jiǔ bì fēn

Definitions (CC-CEDICT)
  1. 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])
  2. fig. things are constantly changing