Mozi (The Book of Master Mo)

The Mozi's core method is the use of fa—practical standards, models, or paradigms against which conduct and judgment are measured. The Mohists do not seek abstract definitions or deductive principles; they compare actions to reliable exemplars, ultimately treating Heaven's intention as the highest standard, likened to a carpenter's square or a wheelwright's compass . What this framework rejects is the Confucian reliance on ritual tradition and the exemplary virtue of past sages as sufficient guides. It also rejects fatalism, partiality, and aggressive war as failures to meet the standard of benefit to the people. The ten doctrines are applications of this method to specific domains: governance, care, expenditure, and military defense .

The core chapters are organized into ten triads—three essays for each doctrine, labeled 'upper,' 'middle,' and 'lower.' Analysis of language and content shows these versions belong to different chronological strata, with later essays modifying and supplementing earlier ones, addressing objections, and developing more sophisticated positions . Most pre-Han Chinese writing placed ideas in the mouths of venerated figures, and the Mozi's constant attribution to 'Our Master Mozi' does not guarantee that Mo Di himself authored every doctrine. Different writers or editors, possibly from different Mohist factions, produced the strata. The triads therefore preserve a record of internal debate and development, not a unified system delivered by one thinker .

The final twenty-one books of the Mozi are devoted to defensive warfare: siege tactics, fortification construction, and city defense. These are not a contradiction of the anti-war doctrine but its practical complement. The Mohists condemned offensive aggression (Fei Gong) while recognizing that a strong defense was essential to state survival. Many Mohists concluded that since gratuitous warfare was wrong, they had a duty to assist its victims, and some became specialists who rushed to aid besieged cities . The military chapters preserve the technical knowledge of these militias. Reading the Mozi as a whole therefore reveals a school that paired ethical argument with practical intervention, not a pacifist retreat from the world.

Johnston's The Mozi: A Complete Translation, first published in 2010 by the Chinese University Press, is the first complete English translation of the entire text and the first bilingual edition in any European language . Earlier translations, such as Burton Watson's Mozi: Basic Writings (2003), offered selections focused on the core philosophical doctrines . Johnston includes the 'Epitomes,' the ten triads, the Later Mohist Canons, the dialogue chapters, and the full military defense section. A revised edition was published by Penguin Classics in 2013 as The Book of Master Mo, with additional editorial material and a new introduction . Johnston's complete edition remains the standard scholarly resource for the full corpus.

Books 40–43, the 'Canons and Explanations,' contain some of the most technically demanding material in early Chinese philosophy: logic, epistemology, semantics, and proto-scientific inquiry. These chapters are largely absent from the core doctrinal triads and represent a distinct phase of Mohist thought, often studied separately as 'Later Mohist logic.' The Stanford Encyclopedia notes that the Canons address problems of naming, similarity and difference, causation, and ethical judgment with a sophistication that has no parallel in the Analects or the Daodejing. Their inclusion in the Mozi makes it not merely a repository of ethical doctrines but a record of one of the most analytically rigorous schools of the Warring States period .