?What does it mean to accumulate soil to become mountains and to accumulate water to become seas? Where does it come from?

Source: "Xunzi·Ruxiao": "Pile up soil to form a mountain, accumulate water to form a sea."

Interpretation: Pile up soil to form a mountain, store water to form a mountain. It can become an ocean. Metaphorically, a little makes a lot.

Pronunciation: jī shuǐ wei shān, jī shuǐ wei hǎi