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Mencius on Trusting Books: Critical Reading Without Rejecting Reading
A saying against unquestioning belief should not become an unquestionable saying. Read the specific passage, its reasons, and what those reasons cannot settle.
Continue past the familiar saying
In Jinxin Lower, Mencius says that entirely trusting the Shu would be worse than having no Shu. The next sentence names Wucheng and says he accepts only a small part of it. Shu here has a specific classical reference, the Book of Documents. Expanding it immediately into every book in existence removes the object identified by the passage itself.
Mencius continues by questioning the description of blood flowing strongly enough to carry a pestle when the most humane ruler attacks the least humane. He is not merely throwing a book away. He identifies a statement he finds unacceptable and offers a reason. The received text supports analysing that argument; it does not prove that the original physical copy he read remains available to us.
Identify the statement being challenged
The received Wucheng chapter contains a related sequence about the army facing no enemy, troops turning their weapons, and blood flowing strongly enough to float a pestle. Reading this alongside Mencius makes the point of contention clearer. It connects the challenge with a particular victory narrative rather than treating it as a general suspicion about words on a page.
There is an essential textual limit. We cannot assume, without investigating transmission, that today’s received Wucheng is a word for word reproduction of the copy available to Mencius. This article compares the relevant expressions, not manuscript authenticity, battle size, or casualties. Neither the striking image nor Mencius’s challenge provides a sound numerical estimate of deaths. A vivid description is not automatically a precise count.
His reason is also open to examination
Mencius’s objection rests on the idea that a humane ruler has no opponent, and that supreme humanity overcoming extreme inhumanity should not produce the reported bloodshed. The text establishes that he offers this moral argument. It does not turn that argument into a completed investigation of a battlefield. Ethical reasoning and evidence about an event do different kinds of work.
A reader can still ask whether a just cause necessarily meets no fierce resistance, or how defections and fighting within an opposing army should be understood. The short passage does not answer every such question. Respect for Mencius need not make all his inferences historical facts. If we invoke him against unquestioning trust while making his own reasons immune to scrutiny, we have restored the very habit we meant to challenge.
Name the problem before deciding what to accept
Imagine an essay claiming that a custom has always been practised everywhere. This is a hypothetical reading exercise. Ask which period, location, and material the author actually supplies. Does one local record become a statement about all places? Identifying that inferential gap is more useful than answering the author with a famous sentence about not trusting books.
Evidence may support the narrower claim that a particular practice existed in a particular place and time. Retain that part while withholding the larger conclusion. One unsupported assertion does not automatically make an entire essay false, and one accurate detail does not validate every later assertion. Such reading still needs books, sources, and attention to the actual words. It refuses to replace specific examination with either complete acceptance or complete rejection.
Let doubt lead to another act of reading
A book may be worth reading without every sentence being acceptable. An argument may deserve questioning without its author becoming worthless. Keeping both distinctions avoids alternating between admiration and wholesale dismissal whenever a new detail appears. The important element in the saying is its objection to accepting everything without making distinctions.
Apply that discipline to the saying itself: identify its context, its object, its stated reason, and the limit of what that reason establishes. Doubt that stops at a slogan can harden into another certainty. Doubt directed towards a particular passage, inference, or missing source can open the next investigation. Mencius’s challenge deserves reading, and his method of making the challenge deserves examination as well.
Sources and further reading
Critical reading of received primary texts; no identity with an original manuscript or verification of battle casualties is asserted.