A drop of water which falls into a great ocean will neither be exhausted nor cease to exist until the end of the universe. Likewise, a virtuous root dedicated toward attaining enlightenment will neither be exhausted nor cease to exist until you reach perfect enlightenment.

The Sutra spoken by Noble Inexhaustible Intelligence

一滴之水墮大海中；其滴雖微終無滅盡。
菩薩善根願向菩提；亦復如是無有滅盡。

大方等大集經