ㄏㄨㄚˋㄉㄧˋˋㄒㄧㄢˋhuàdì‑zìxiàn

画地自限
  1. 形容自我設限突破 學問沒有止境千萬不要畫地自限」。

lit. to draw a line on the ground to keep within (idiom)​, fig. to impose restrictions on oneself