Wood will wither without roots, and water will be exhausted without sources. -Feng Ming and Meng Long's History of the Eastern Zhou Dynasty
Always think of possible difficulties and dangers.
amount to
Soldiers against generals, soil against water-take appropriate measures as appropriate.
What I've been through, I know the pros and cons.
People who live in mountainous areas depend on mountains for a living, while those who live by water for a living; People who live in the mountains live by the mountains, while those who live by the water ―― make use of local resources.
People who enjoy the fruits of labor.
Running water will never taste bad, and door hinges will never be moth-eaten ―― used things will not rot.
Water without a source, wood without a root ―― something without a solid foundation.
The last drop of water you see will be your tears.