F051 • Informal - Relevance/Insufficiency
Also known as: Argumentum ex Silentio, Appeal to Silence, Argument from Lack of Mention
We notice that a source -- a historical text, a person, a record -- does not mention something, and we take that silence as evidence that the thing did not happen, does not exist, or is not true. The absence of a voice is treated as though it spoke.
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Silence has many parents. A historical text might not mention an event because the author did not know about it, did not consider it important, was writing for a different purpose entirely, was censored, or simply ran out of parchment. A person who does not respond to an accusation might be unaware of it, might be acting on legal advice, might consider it beneath response, or might simply be busy. We tend to underestimate how many reasons there are for silence and overestimate how much silence tells us. This is partly because our minds are narrative machines -- we look for signals and meanings in everything, including the gaps. When a text does not mention something we expected, the absence itself feels like a message. And sometimes it is. If a meticulous, comprehensive source that would certainly have recorded an event fails to mention it, that silence is informative. But most sources are not meticulous, not comprehensive, and not writing about the things we are looking for. The skill is in knowing which kind of silence you are hearing.
| When dealing with comprehensive, systematic records where omission is highly significant. |
| When the source would certainly have mentioned something if it occurred. |
| When multiple independent comprehensive sources all fail to mention something expected. |
| Notice when you are treating the absence of mention as equivalent to the presence of a denial. 'The text does not say X' and 'The text says X did not happen' are very different statements, but they can feel the same. |
| Watch for the assumption of comprehensiveness. Ask yourself: was this source trying to cover everything? Did the author have access to the information in question? Is this the kind of thing they would have included? |
| Pay attention to your expectations. The strength of an argument from silence depends entirely on whether the silence is surprising. If you expected the source to mention something and it did not, that is more informative than if the topic was outside the source's scope. |
| Notice when silence is being personified -- when 'they did not say anything' is being treated as though 'they said something by not saying anything.' Sometimes silence is just silence. |
| Ask yourself: how many other things did this source also not mention? If the list is long, the absence of any particular item is less meaningful. |
| Thinking that silence never carries information. In truly comprehensive sources -- systematic surveys, complete inventories, thorough investigations -- the absence of something can be significant. The question is always how complete the source is and whether it would have recorded the thing in question. |
| Not accounting for survivorship in historical records. We have only a fraction of what was written in the ancient world. Concluding that something did not exist because it does not appear in surviving texts ignores the vast amount of text that has been lost. |
| Applying this pattern symmetrically -- treating the silence of one source as equally meaningful as the silence of many independent sources. Multiple independent comprehensive sources all failing to mention something carries much more weight than a single source's silence. |
| Argument from Silence |
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| Concluding that something did not happen, does not exist, or is not true because it is not mentioned in historical records, texts, or other sources. The silence or absence of mention is treated as positive evidence of absence. |
| Silence or omission from records can have many explanations besides non-existence or non-occurrence. Historical records are incomplete, biased, and selective. Authors may omit information for many reasons: irrelevance to their purpose, assumed common knowledge, lack of awareness, censorship, or simple oversight. Absence of documentation is not equivalent to documentation of absence. |
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