The Mozi Book: The Ten Doctrines of a School That Disappeared
The Mozi book (墨子, Mòzǐ) is the surviving corpus of Mohism: fifty-three chapters arguing for impartial care, promotion by ability, frugality, and opposition to aggressive war, with later chapters on logic, optics, and siege defence. Summary: measure every practice by whether it produces benefit, and stop caring less about strangers than you do about your own household. It’s the most important philosophical book nobody reads, mostly because its fortunes collapsed two centuries after its founder died and the text is badly damaged as a result.
The Mozi at a glance
Feature | Detail |
Chinese title | 墨子 Mòzǐ |
Attributed to | Mozi (墨翟, c. 470–391 BCE) and his followers |
Extant chapters | 53 of an original 71 listed in the Han catalogue |
School | Mohism |
Ten core doctrines | 尚贤, 尚同, 兼爱, 非攻, 节用, 节葬, 天志, 明鬼, 非乐, 非命 |
Unlike contemporary schools | It argued from consequences rather than from tradition |
Read it for | Impartial care as policy, merit over birth, and the earliest Chinese logic |
What kind of book is it?
A school’s papers rather than one man’s argument, and visibly so. The same doctrine is argued three times over, in three versions, because the Ten Doctrines were each taught in triplicate and the versions circulated separately. Then the book abruptly becomes something else: somewhere around chapter 40 it turns into definitions and paradoxes, then again into siege engineering.
Chapters | Group | Contents |
1–7 | Opening essays | Shorter pieces on self-improvement, standards, frugality |
8–39 | The Ten Doctrines | Each in 上/中/下 versions, many now lost |
40–45 | The Later Mohist corpus | Definitions, logic, optics, geometry, mechanics |
46–50 | Dialogues | Mozi arguing with Confucians and rulers |
52–71 | Siege defence | Fortification, counter-mining, equipment — largely lost |
That last block is why calling Mozi a pacifist is close to inverting him. Roughly a third of the original book is military technology, and the tradition holds that he walked ten days to stop Chu attacking Song and then stationed disciples on Song’s walls with equipment he’d designed. Mozi covers the man and that story.
The Ten Doctrines, each usually summarised in a slogan and worth reading past:
Doctrine | Slogan | Reality |
尚贤 Shang xian | Promote the worthy | Office should follow ability, not birth |
尚同 Shang tong | Conform upward | Agreed standards, not necessarily uniformity of belief |
兼爱 Jian ai | Impartial care | Conduct standard, not a requirement to feel anything |
非攻 Fei gong | Against aggression | Condemns offensive war; defence is a different argument |
节用 Jie yong | Frugality | Cut expenditure that produces no benefit |
节葬 Jie zang | Modest funerals | Attacking elaborate mourning as pure waste |
天志 Tian zhi | Will of Heaven | Heaven as an objective standard with preferences |
明鬼 Ming gui | On ghosts | Evidence-based argument that spirits exist and watch |
非乐 Fei yue | Against music | Instrumental case that music diverts resources |
非命 Fei ming | Against fatalism | Doctrine that effort changes outcomes |
Who wrote it, and when?
Mozi himself probably wrote or dictated the earliest versions of the core chapters, and later Mohists wrote the rest. The triplicate structure is the giveaway: there are three versions of 兼爱 because there were three Mohist lineages recording the teaching. Later editors preserved all three rather than picking one.
The “Later Mohist” chapters (40–45) are almost certainly not his. They read like a separate discipline: definitions of space, duration, and motion; paradoxes about whether a shadow moves; worked solutions in optics and mechanics. Nobody in China did anything comparable again, and then the whole school stopped being taught.
The damage, which matters more than usual here
The Han dynasty catalogue lists seventy-one chapters. Fifty-three survive, and the losses are uneven:
Doctrine | What survives |
兼爱 Jian ai | All three versions extant |
非攻 Fei gong | All three extant |
尚贤, 尚同 | All three extant |
节用 | 上 and 中 only; 下 is lost |
节葬 | 下 only; the first two are lost |
天志 | All three extant |
明鬼 | 下 only |
非乐 | 上 only |
非命 | All three extant |
非儒 | 下 only |
Chapters 52 through 71, the siege manuals, are mostly gone, with fragments and a handful of intact chapters remaining. This is not a footnote. When a doctrine loses two of its three statements, you’re reading a case argued once out of three, with no cross-check.
The passages people come for
The best single argument in the book, and the one nobody quotes in full:
“Suppose a man enters someone’s orchard and steals their peaches and plums. Everyone who hears of it condemns him, and those in authority punish him. Why? Because he benefits himself by harming another. Take a man who robs others of dogs, pigs, chickens, or piglets — that is even more unrighteous, and the harm done is greater, so the crime is heavier. Now take invading another state. The gentlemen of the world all declare it righteous and praise it. Can this be called knowing the difference between righteous and unrighteous?
— Mozi 17「非攻上」· 今有一人，入人园圃，窃其桃李…今至大为攻国，则弗知非，从而誉之，谓之义。此可谓知义与不义之别乎 · translated from the Chinese
Nobody has improved on it in twenty-three centuries. The ladder runs: steal fruit → steal livestock → kill one person → kill a hundred → invade a state, with the crime getting heavier at each rung while the praise gets louder at the last. The chapter doesn’t argue against violence; it argues that whatever principle you’re using to condemn the fruit thief is also available for the invasion, and that you have declined to use it.
“When a state has many worthies, its governance is thick; when it has few, its governance is thin. So the task of those in power is simply to increase the number of the worthy.”
— Mozi 8「尚贤上」· 是故国有贤良之士众，则国家之治厚，贤良之士寡，则国家之治薄。故大人之务，将在于众贤而已 · translated from the Chinese
The sentence before it in the chapter is the diagnosis: rulers want wealth, population, and order, and end up with poverty, scarcity, and disorder, because they’ve been promoting the wrong people. Then he asks what you’d do if you wanted more archers, enrich them, honour them, respect them, praise them, and observes that the same mechanism works for the competent.
“A sage governing one state can double its wealth. Extended to governing the world, the world’s wealth can be doubled. The doubling doesn’t come from seizing land abroad; it comes from cutting useless expenditure at home.”
— Mozi 20「节用上」· 圣人为政一国，一国可倍也…其倍之非外取地也，因其国家，去其无用之费，足以倍之 · translated from the Chinese
The rest of the chapter is a product teardown: clothing exists to keep you warm or cool, so add only what increases warmth or coolness and discard anything that doesn’t. Same test for houses, for weapons, for boats and carts. It reads like engineering because it is.
One thing gets lost before everything else about the 兼爱 chapters: nothing in the text asks anyone to feel anything. Here is the frame he actually uses:
“Even among thieves and robbers it’s the same: the thief loves his own house and not another’s, so he steals to benefit his own house. The robber loves himself and not others, so he robs to benefit himself. All of this arises from not caring for one another.”
— Mozi 14「兼爱上」· 虽至天下之为盗贼者亦然…皆起不相爱 · translated from the Chinese
Note the structure. He doesn’t say people are selfish by nature; he says every actor in a disordered world is optimising for their own unit, and that the unit, not the selfishness, is the variable to fix.
Which lines in this book are misattributed to it?
“Mozi cares for all alike; he would rub himself smooth from crown to heel if the world gained by it, and do it.”
— Not Mozi’s own words, and not in this book. Mencius 7A26 · 墨子兼爱，摩顶放踵利天下，为之 · translated from the Chinese
摩顶放踵 is the sentence everyone reaches for when summarising the Mozi, and it belongs to a hostile critic. It’s Mencius describing him, in the same breath as he describes Yang Zhu as a man who wouldn’t pluck a hair to benefit the world. A pair of caricatures drawn to argue that both extremes damage the Way. The phrase never appears in these fifty-three chapters. If you’re quoting what the Mohists said about themselves, quote them.
Two additional traps specific to this book:
“Universal love” is a translation decision, not a Chinese one. Nothing at any point in the text asks anyone to feel affection for strangers. 兼 is about not discounting. Roughly a third of what gets filed under “Mozi on love” is undigested English.
And the 兼爱 chapters survive in all three versions, which means quote collections silently mix 上, 中, and 下 together. They don’t say the same things. Cite which one you took the line from.
How to read it
Read 17「非攻上」 first. It’s short, it’s the best thing in the book, and it shows you immediately that this isn’t a school of warm slogans.
Then 8「尚贤上」, 14「兼爱上」, and 20「节用上」. That’s enough to know whether Mohism is for you. From there either take the rest of the triplicate versions, or jump to chapters 40 through 45 and read some early Chinese optics. Which is a strange and excellent afternoon.
Keep The Analects open beside it. Every Mohist doctrine is a direct answer to a Confucian practice, and the argument makes considerably more sense when you can hear what it’s against. Then Mencius for the Confucian reply, which is also where the 摩顶放踵 line above comes from, or Han Feizi for someone who shared Mohist suspicion of inherited rank and reached the opposite conclusion about what to do about it. Mohism covers the school and how thoroughly it vanished.
What it holds
Jian ai
Impartial care as a political claim, not a feeling for everyone at once.
Fei gong
Aggressive war fails the test of benefit. Defense is not the same argument.
Shang xian
Raise the worthy. Birth is not a qualification.
Test the doctrine
Later chapters ask what a teaching produces, and whether it can be examined.
Questions People Ask
What is the book Mozi?
The corpus of Mohism: inclusive care, opposition to aggressive war, merit-based office, frugality, and later chapters on logic and argumentation.
How many chapters does the Mozi have?
Fifty-three remain. The Han dynasty catalogue listed seventy-one, and eighteen are lost, including most of the siege-defence manuals.
What is jian ai?
Usually translated “universal love” or “impartial care.” It asks you to treat another’s state, house, and person as you’d treat your own. A standard for conduct judged by results, not a demand that you feel affection for everyone.
Was Mozi a pacifist?
No. He opposed offensive war specifically and argued that defensive war is justified. Much of the original book is siege defence technology.
Why did Mohism disappear?
Scholarly opinion varies, but its demands were expensive, its organisation depended on a disciplined hierarchy that lost state support, and after the Qin unification there was very little room for a school that functioned like a paramilitary order. It was largely dormant by the Han.