There is a frog in a shallow well. It said to the big turtle from the East China Sea, "How happy I am! Go out to play, jump on the railing of the wellhead, come back to rest and squat down in the brick hole of the broken shaft wall to rest; Jumping into the water, the water just holds my armpits and cheeks; When I step on the mud, the depth of the mud can only drown my feet and overflow my instep. Look back at those bugs like red worms, crabs and tadpoles, which one can compete with me one day! Moreover, I own a puddle, and I can jump on the well if I want, and stop if I want. Really happy! Why don't you come to see me often? "

The tortoise's left foot hasn't stepped into the well yet, and its right leg has been stuck by the borehole wall. So, it quietly stayed by the well for a while, and then came back to tell the frog the scene of the sea, and said, "a thousand miles is indeed far away, but it can't describe the vastness of the sea;" It's really high, but it can't control the depth of the open sea. In the Xia Dynasty, 10 had a flood for nine years, but the sea water did not increase; In Shang Tang, there were seven years of drought in eight years, but the sea water did not seem to decrease. The eternal sea will not change with the length of time, nor will it fluctuate because of the amount of rainfall. This is the greatest happiness in the East China Sea! "

When the frog in Asai heard this, his eyes widened with fear, as if he had lost his mind. I deeply feel my own smallness.

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It means that the universe has no end and knowledge is endless. This fable warns people not to be complacent about a single point of view, let alone a single achievement.