Long ago, the Yellow River was home to a river god named Feng Yi, respectfully called He Bo, who lived near the Mengjin ferry crossing in present-day Meng County, Henan Province.
The river god Hebo had always believed that the Yellow River, where he resided, was the greatest river under heaven—no other river could match its vastness and volume—so he never ventured far from its banks.
When autumn arrived, relentless rains swelled every stream and river, all surging into the Yellow River. The river's channel could not contain such a deluge, so water overflowed its banks, submerging sandbars and flooding the lowlands on both sides.
As a result, the Yellow River suddenly became far wider than usual, and looking across the water, one saw only rolling waves so vast that even the cattle and horses on the opposite bank were completely invisible.
When the River God Bo saw the immense floodwaters, he swelled with pride, believing all the waters under heaven had flowed into his river. So, in high spirits, he journeyed eastward along the current.
When the River God traveled east to the end of the Yellow River and reached the vast North Sea (the Bohai Sea), he surfaced and gazed eastward, seeing only an endless expanse of white waves crashing against the blue sky. This immense sea was unlike anything he had ever seen—the Yellow River could not compare. Astonished, he exclaimed, "I thought my river was the greatest, but here I see true vastness!"
“Heavens! Besides the Yellow River, there is actually such a vast expanse of water in the world!”
At this point, the River Earl was no longer smug. Turning around, he looked up at Ruo, the god of the North Sea, and sighed, "As the saying goes, 'One who has heard a hundred truths thinks he knows everything and looks down on everyone.' That must be me. I've heard that Confucius was the most learned and Boyi the most righteous, yet even they were scorned by some. I couldn't believe it. But today, seeing the vast, endless blue waves of the sea, I realize those words were not false. If I hadn't come here and witnessed the boundless North Sea with my own eyes, how could my horizons have been broadened? I would forever be laughed at by the truly wise!"
The God of the North Sea nodded and comforted the River God, saying, "Indeed, you cannot speak of the sea to a frog at the bottom of a well, for it is confined by its home and knows nothing of the ocean. You cannot speak of ice to a summer insect, for it is bound by the season and knows nothing of winter. And you cannot speak of profound truths to a narrow-minded person, for they are shackled by their own limited education."
As the River God listened, he nodded in agreement, realizing that everything the Sea God Beihai Ruo said was wisdom he had never encountered before.
The God of the North Sea, seeing he was willing to listen, continued, "Now that you have left the high banks of the Yellow River and seen the great sea, you realize through comparison how shallow your knowledge is. Only now can I speak with you about profound truths."
The River God of the North Sea then shared profound wisdom with the River God of the Yellow River.
"Wang Yang Xing Tan" — "wang yang" means to look up, not "gazing at the ocean." It originally described feeling one's own insignificance upon witnessing another's greatness. Later, it came to mean feeling helpless due to insufficient strength, lack of means, or unfavorable conditions.
Source: *Zhuangzi*, "Autumn Floods"
Meaning of the Idiom: Later, the Chinese idiom "望洋兴叹" came to describe feeling helpless due to insufficient strength, lack of means, or unfavorable conditions.