飲水思源
yǐn shuǐ sī yuán
Meaning:
spril showers bring May flowers.
lit. when you drink water, think of its source;
gratitude for blessings and their well-spring.
Don't forget where your happiness come from.
Be grateful for all your blessings!
飲(yǐn
)：to drink
水(shuǐ
)：water
思(sī )：to think
源(yuán
)：source
..
