飲水思源

Etymology
From "Tune in the Key of Zhǐ" (徵調曲) written by  during the :



i.e. remember where and how the fruit/water came from. Don’t just be thankful for the fruit/water. The idiom makes use of the latter half: be thankful for all the elements and processes (both past and present) that allowed you to enjoy that humble cup of water.

Idiom

 * 1) to remember where one's happiness comes from; to not forget one's roots or heritage