A frog lived in a shallow well.
One day, it met a large soft-shelled turtle from the sea by the well.
The frog bragged to the turtle: "Look how happy I am here! When I'm glad, I bounce near the well. When tired, I rest in the brick hole. Sometimes I soak in the water, showing only my head. Sometimes I stroll in the soft, comfortable mud. None of the tiny crabs or tadpoles can compare. I am the master here, free and unrestrained. Why don't you come play in the well more often?"
Hearing this, the turtle was itching to look inside. But before his left foot entered, his right foot stumbled. He quickly retreated and told the frog about the sea: "Have you seen the sea? It's immensely wide, over a thousand li, and profoundly deep, over a thousand zhang. In ancient times, nine years in ten had floods, yet the sea's water rose little. Later, seven years in eight had droughts, yet the sea's water dropped little. Neither great floods nor droughts affect the sea. Only by living in the sea can one know true happiness!"
Amazed by the turtle's words, the frog was left speechless.