愚公移山 (Yú Gōng Yí Shān) — The Foolish Old Man Removes the Mountains
The Concept
English: Optimism Bias — The tendency to overestimate the likelihood of positive outcomes and underestimate negative ones; believing we are less at risk than others.
Chinese: 愚公移山 (Yú Gōng Yí Shān) — The foolish old man removes the mountains.
Cultural Origin
This famous parable from the Liezi (列子):
An old man of ninety, called the Foolish Old Man (愚公), lived between two massive mountains. Travel to the south required a long detour.
He gathered his family and proposed removing the mountains. His wife objected: “You cannot even move a small hill. What about these mountains? Where will you put the earth?”
He replied: “Dump it in the sea.”
He began digging, basket by basket. A wise old man (智叟) laughed at him: “You are so old and weak. You cannot move even a fraction of these mountains.”
The Foolish Old Man replied: “Though I die, I have sons; my sons have grandsons, and their sons will have more sons. The mountains will not grow, but my descendants are endless. Why cannot they be removed?”
The Emperor of Heaven, moved by his determination, ordered the mountains moved.
The Bias of the Foolish
The Foolish Old Man’s optimism is the essence of optimism bias:
- He underestimated the difficulty (two massive mountains)
- He overestimated his capacity (ninety years old with baskets)
- He ignored base rates (no one had ever moved mountains)
- He believed his determination would succeed where others failed
And he was right—through divine intervention that cannot be planned for.
The Two Faces of Optimism
The parable has two readings:
- Inspirational: Persistence triumphs over impossible odds
- Cautionary: Irrational optimism succeeds only through luck (divine intervention)
The optimism bias lies in believing the inspirational reading is the norm. Most foolish old men who try to move mountains die with mountains unmoved.
Historical Manifestations
- The First Emperor’s Quest for Immortality: Believing he could achieve what no human had, Qin Shi Huang consumed mercury compounds that hastened his death.
- The Ming Dynasty’s Treasure Fleets: Optimistic about China’s capacity to project power, the Yongle Emperor launched massive fleets that were eventually abandoned as unsustainable.
- The Great Leap Forward: Belief that willpower could overcome agricultural reality led to one of history’s greatest famines.
Confucian vs. Daoist Perspectives
Confucius might have counseled the Foolish Old Man to accept the mountains and focus on what he could actually accomplish: “知之为知之，不知为不知，是知也” (To know what you know and know what you do not know is true knowledge).
Laozi would have suggested going around the mountains rather than moving them: “上善若水，水善利万物而不争” (The highest good is like water; water benefits all things without contention).
Both traditions suggest the Foolish Old Man was indeed foolish—his success was luck, not wisdom.
Modern Applications
Optimism bias appears in:
- Entrepreneurship where founders believe they will succeed despite 90% failure rates
- Marriage where couples underestimate divorce probability
- Health where people underestimate their risk of disease
- Projects where planners consistently underestimate time and cost
Each is moving mountains with baskets, hoping for divine intervention.
The Lesson
The Foolish Old Man teaches that optimism can succeed—but only through luck we cannot control. The wise person:
- Recognizes when optimism is bias rather than justified confidence
- Plans for failure even while hoping for success
- Distinguishes between what persistence can achieve and what requires fortune
正如列子所言：“虽我之死，有子存焉。” (Though I die, sons remain.)
The mountains moved because Heaven willed it, not because baskets could. Do not confuse luck with strategy.