John Locke

John Locke's philosophy grew out of a working political life, not a quiet academic one. After Oxford, where he trained in medicine as well as the standard curriculum, Locke became physician and close advisor to Anthony Ashley Cooper, later the first Earl of Shaftesbury, a leading opposition politician whose fortunes Locke's own rose and fell alongside for over a decade. When Shaftesbury's attempt to exclude the Catholic heir presumptive James from the English throne collapsed and Shaftesbury fled into exile, Locke followed him to the Dutch Republic, spending years there under suspicion from the English crown before returning only after the 1688 Glorious Revolution replaced James with the Protestant William and Mary.

He published his two major works anonymously that same return year, 1689: An Essay Concerning Human Understanding, arguing the mind begins as a blank slate, a tabula rasa, filled entirely through sensory experience and the mind's reflection on it rather than through any innate ideas implanted before birth, and the Two Treatises of Government, arguing that legitimate political authority rests on the consent of the governed, that individuals possess natural rights to life, liberty, and property that government exists to protect rather than grant, and that a government that betrays that trust may rightly be resisted by the people. Locke did not publicly acknowledge authorship of either book until near the end of his life, a caution shaped by the political dangers his own recent exile had made concrete.

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

Locke's Essay Concerning Human Understanding did not stop at arguing where ideas come from; a later chapter, added to the second edition in 1694, took up a harder question, what makes a person at one time the same person as someone at an earlier or later time, given that the physical body visibly changes across a life. Locke's answer separated personal identity from the identity of the body or even the soul entirely: a person, he argued, is the same person across time only insofar as present consciousness can extend backward through memory to that earlier experience, so identity is a matter of continuous consciousness rather than of an unchanging physical or spiritual substance underneath it.

To make the claim vivid, Locke offered a thought experiment later commentators nicknamed the prince and the cobbler: if the prince's consciousness, complete with all his memories, were somehow transferred into the cobbler's body, Locke argued the resulting person would rightly be considered the prince in the cobbler's body, since personal identity travels with memory and consciousness rather than with the physical shell carrying them.

The argument had consequences Locke drew out explicitly for morality and law: since responsibility and reward properly attach to the person, not the body, someone who genuinely could not remember an act, on Locke's account, could not justly be punished for it, a claim that made memory itself, for the first time in modern philosophy, load bearing for questions of guilt and justice.