月落ちて天を離れず

水流入元海
 月落不離天

水流れて元の海に入り

月落ちて天を離れず

Although the flow of the water goes different places, 

it arrives back into the original ocean. 

Although the moon disappears as if it had fallen, 
it is all the time there up in the sky. 

We are just not able to see it.

（『五燈会元』より 福厳守初禅師の言葉）