What does it mean that water is a waterfall when desperate, and people are reborn when desperate?

When the water reaches the insurmountable end, it forms a magnificent scenery (water will fly down and become a waterfall when it meets a cliff), and people will be reborn when they encounter despair.

No matter in nature or in human society, despair is not invincible, and it often rebounds to a new and higher level after encountering despair.

"Water to despair is a landscape, and people to despair is a rebirth", "Mountains are heavy with water, but there is no road to doubt, and there is another village", which is often used to encourage people to maintain an optimistic and positive attitude, regard difficulties and setbacks as wealth, lose hope in despair, turn over against the wind and regain a new life.