A hallucination is a fact, not an error; what is erroneous is a judgment based upon it." - Meaning and context.">
On the Nature of Acquaintance: Neutral Monism (1914)

People are said to believe in God, or to disbelieve in Adam and Eve. But in such cases what is believed or disbelieved is that there is an entity answering a certain description. This, which can be believed or disbelieved is quite different from the actual entity (if any) which does answer the description. Thus the matter of belief is, in all cases, different in kind from the matter of sensation or presentation, and error is in no way analogous to hallucination. A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.

— Bertrand Russell

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "People are said to believe in God, or to disbelieve in Adam and Eve. But in such cases what is believed or disbelieved is that there is an entity answering a certain description. This, which can be believed or disbelieved is quite different from the actual entity (if any) which does answer the description. Thus the matter of belief is, in all cases, different in kind from the matter of sensation or presentation, and error is in no way analogous to hallucination. A hallucination is a fact, not an error; what is erroneous is a judgment based upon it." in the context of "On the Nature of Acquaintance: Neutral Monism (1914)" to mean that wisdom is timeless.

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Source: Wikiquote: "Bertrand Russell" (Quotes, 1910s) The 'What it means' explanation text was generated by Google Gemini Flash (accessed February 08, 2026). https://gemini.google.com/app
Bertrand Russell

About Bertrand Russell

Bertrand Arthur William Russell, 3rd Earl Russell (May 18, 1872 – February 2, 1970) was a British philosopher, logician, mathematician, historian, and social critic. In 1950, he was awarded a Nobel Prize in Literature.