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|Brief=A British philosopher who championed empiricism, arguing that all knowledge was derived from experience
|Summary='''John Locke (1632-1704)''' was a British philosopher, writer, political activist, medical researcher, Oxford academic, and government official. Among his most notable works is ''An Essay Concerning Human Understanding'', which provides a defense of empiricism and the origins of ideas and understanding. In this work, Locke rejects the idea of innate principles, and argues that all knowledge comes from experience. Locke also wrote on religious toleration and social contract theory. He opposed authoritarianism and argued that individuals should use reason to discover the truth.
|Historical Context=Locke was born into a an English Puritan family of modest means, but was able to obtain an excellent education by way of his father's connections. [[CiteRef::Dunn (2003)]] In 1647, at the age of fifteen, he began studies at Westminster School, considered London's best. At twenty, he began studies at Christ Church College, Oxford. His studies focused on logic, metaphysics, and languages taught within the framework of '''Aristotelian scholasticism''', for which he developed an intense dislike. [[CiteRef::Uzgalis (2016)| pp. 3-4]][[CiteRef::Milton (1994)]] Nicholas Copernicus (1473-1543) had posited his '''heliocentric cosmology''' in 1543, more than a century earlier. Forty years earlier, Galileo Galilei (1564-1642) published his observations with the telescope in 1610. These developments had cast Aristotelianism into doubt. [[CiteRef::Westfall (1980)|p. 6]] Like many ambitious students of the time, Locke sought alternative resources outside the formal curriculum, which were abundant at Oxford. He became involved with a discussion group organized by John Wilkins (1614-1672)and was exposed to the '''experimental philosophy''' and the ideas of Francis Bacon (1561-1626) who argued for an '''inductive methodology''' for science. The Wilkins group was the nucleus of what would later become the 'Royal Society of London for Improving Natural Knowledge', known simply as the '''Royal Society'''. England's main society for the promotion of natural philosophy, the Royal Society became a formal institution in the 1660's. The society would set itself in opposition to the Aristotelian scholasticism of the universities, advocating the study of nature rather than of ancient texts. [[CiteRef::Uzgalis (2016)|p. 4]] Locke's notebooks indicate a strong interest in medicine and chemistry. He attended the lectures of the great anatomist Thomas Willis (1621-1675) and took careful notes. [[CiteRef::Rogers (1982)|p. 217]][[CiteRef::Anstey (2011)|p. 6]]
After Locke received his bachelor's degree in 1656, he remained at Oxford to study medicine. He worked closely with Dr. Thomas Sydenham (1624-1689), renown for his pioneering work in the treatment of infectious diseases. [[CiteRef::Dunn (2003)]] Robert Boyle (1627-1691) succeeded John Wilkins as the leader of the scientific group at Oxford, and became Locke's scientific tutor. Boyle ascribed to the '''corpuscular mechanistic philosophy''' associated with [[Rene Descartes]] (1596-1650), and was noted for his physical experiments. The corpuscular philosophy held that the visible properties of the natural world were due to interactions between invisibly small particles or corpuscles. Locke read Boyle's and Descartes works, as well as those of Pierre Gassendi (1592-1655), who emphasized the role of the senses in knowledge. He learned from his experimentalist associates and from the writings of Gassendi, to be skeptical of Descartes' '''rationalism'''. [[CiteRef::Uzgalis (2016)]][[CiteRef::Dunn (2003)]][[CiteRef::Fisher (2014)]] He accepted Descartes' corpuscular view of matter, his dualistic view that mind and matter were separate substances, and believed the world to contain genuine causal interactions between physical objects. [[CiteRef::Rogers (1982)]]
Locke became personal physician to Anthony Ashley Cooper (1621-1683) (Lord Ashley), a leading English political figure during the 1670's and 1680's. [[CiteRef::Dunn (2003)]] He was an early member of the Royal Society and knew most of the major English natural philosophers, including [[Isaac Newton]] (1643-1727) and some continental ones as well. This community was concerned with arguing for the reliability of observation and experiment as a means of acquiring knowledge as opposed to Aristotelian intuition or Cartesian rationalism. [[CiteRef::Uzgalis (2016)|p. 4]] Locke's most important contribution to this argument was his ''An Essay Concerning Human Understanding'', published in 1689. Locke and Newton became directly acquainted while Locke was finishing this work. When Locke read Newton's ''Philosophiae Naturalis Principia Mathematica'', published in 1687, he found epistemological views similar to his own. Both had absorbed the views current in the Royal Society. Locke's essay received its warmest reception from the members of the society, and can be deemed an expression of their collective understanding of scientific methodology. [[CiteRef::Rogers (1982)]]
|Major Contributions==== Locke's Empiricism ===
In the first book of his ''Essay Concerning Human Understanding'' Locke begins by arguing that there are no principles or ideas that are innate in human beings. In seventeenth century England, such principles were widely held to exist and to be necessary to the stability of religion and morality. [[CiteRef::Uzgalis (2016)]] "Nothing is more commonly taken for granted" he wrote, "than that certain principles both speculative and practical are accepted by all mankind. Some people have argued that because these principles are (they think) universally accepted, they must have been stamped into the souls of men from the outset." [[CiteRef::Locke (2015a)|p. 3]] He denies that we hold speculative innate principles, innate ideas of God, identity, or impossibility. If there were such principles, he supposes, they would be known to everyone, even "children, idiots, savages, and illiterate people". [[CiteRef::Locke (2015a)|p. 8]] Mathematical truths likewise cannot be innate, as these must be discovered by reason. [[CiteRef::Uzgalis (2016)]]
