ㄧㄣˇyǐnㄕㄨㄟˇshuǐㄩㄢˊyuán

  1. 比喻不忘本參見飲流懷源兒女英雄傳·》:這等恩情翁姑這等一個才貌雙全夫婿飲水思源打算自己當日此時。」官場現形·二八》:小姪這個官兒還是軍門小姪飲水思源坐視?」恩將仇報忘恩負義

lit. when you drink water, think of its source (idiom)​; gratitude for blessings and their well-spring, Don't forget where your happiness come from., Be grateful for all your blessings!
Gedenke der Quellen, wenn Du trinkst (Sprichw)​