ˋㄎㄜˇˊˇshìkě’érzhǐ

适可而止
  1. 適宜程度停止適宜)​。做事不過 食用補品適可而止不可過量」。

to stop before going too far (idiom)​; to stop while one can, don't overdo it, stop while you're ahead
gemäßigt