The past is not like today. Past people thought differently, valued different things, and inhabited different worlds. Understanding this 'alterity'—this radical difference—is central to historical understanding. Yet historians must use present concepts to understand past difference. The challenge is honoring historical otherness while making the past intelligible to contemporary readers.
The fundamental temptation in studying history is to assume that past people were basically like us — that they wanted the same things, reasoned in the same ways, and would recognize our categories and concerns. This temptation is called presentism, and it is the beginner historian's most reliable error. The concept of historical difference is the antidote: a trained habit of recognizing that the past was, in the philosopher's phrase, a foreign country.
Consider a concrete example. Medieval Europeans did not distinguish between "natural" and "supernatural" as categories. When a peasant attributed a poor harvest to divine punishment, they were not being irrational within a framework that distinguished natural causes from divine ones — they inhabited a world in which God, saints, demons, and physical processes all operated within a single causal system. To call this "superstition" is to impose a post-Enlightenment categorical distinction that they did not possess. The historian's task is to describe their world from within the logic it actually operated by, not to judge it by the logic of a different era.
This is what historians mean by alterity — the radical otherness of the past. The medieval peasant's world was not a deficient or primitive version of the modern world; it was organized by different assumptions about causation, about the body, about time, about the relationship between individual and community. Recovering those assumptions requires patience and the willingness to take past categories seriously on their own terms. When a seventeenth-century surgeon explains bloodletting by reference to humoral theory, the historian does not correct the theory — they ask: what did humoral theory allow this person to see and do, and what did it prevent them from seeing?
The paradox is that historians must use present language and concepts to communicate historical difference to contemporary readers. You cannot write about Roman *virtus* without translating it, but translating it as "virtue" smuggles in Christian ethical connotations that distort the original. The solution is neither to refuse translation nor to translate carelessly, but to be explicit about the gap — to use the original term, gloss it, and flag where the translation is imperfect. This is why good historical writing often preserves untranslated terms with extended explanations: the untranslatability is part of the historical content. Historical difference is not an obstacle to understanding the past; it is the most important thing there is to understand about it.
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