舊的不去，新的不來 [旧－－－－－－－来]

Jyutping gau6 dik1 bat1 heoi3 , san1 dik1 bat1 loi4
Pinyin jiù de bù qù , xīn de bù lái

Definitions (CC-CEDICT)
  1. lit. If the old doesn't go, the new will not come.
  2. You can't make progress by clinging to old notions.