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|Historical Context=David Hume was born in Edinburgh, Scotland in 1711. His family had a modest estate and was socially connected, but not wealthy.[[CiteRef::Norton (2009)]] They recognized that Hume was precocious, and sent him to Edinburgh University two years early (at the age of 10 or 11) with his older brother (who was 12). He studied Latin and Greek, read widely in history, literature, and ancient and modern philosophy, as well as some mathematics and natural philosophy. [[CiteRef:: Morris and Brown (2016)]][[CiteRef:: Harris (2015)|p. 35-65]] Both at home and at the university, Hume was raised in the stern '''Calvinist faith''', with prayers and sermons as prominent features of his home and university life. [[CiteRef:: Morris and Brown (2016)]] Following the completion of his studies, Hume rejected his family's plan that he become a lawyer, and instead determined to become a scholar and philosopher, engaging in three years of intensive personal study. Living in the aftermath of the acceptance of [[Isaac Newton]]'s(1643-1727) revolutionary theories of motion and gravitation, eighteenth century thinkers proclaimed the ''''Age of Enlightenment'''' and expected philosophy (which then included what we would call the natural and social sciences) to dramatically improve human life. [[CiteRef::Bristow (2017)]] Hume, like many of his times, revered Newton, calling him "the greatest and rarest genius that ever arose for the ornament and instruction of the species". [[CiteRef::DePierris (2006)]]
Although little is known of Hume's activities during his schooling and afterwards, he would have spent the fourth year of the curriculum at Edinburgh studying natural philosophy, and would have been exposed to experimental natural philosophy, including Newton's theories. [[CiteRef::Harris (2015)|p. 38-40]] More than thirty years earlier, in 1687, Newton had published his ''Philosophiae Naturalis Principia Mathematica'' (''Mathematical Principles of Natural Philosophy'') in which he put forth his '''laws of motion''', '''law of universal gravitation''', and his inductive '''experimental philosophy''' more than thirty years earlier in 1687. [[CiteRef:: Westfall (1999)]][[CiteRef::Janiak (2016)]] By about 1700 these theories had become [[Theory Acceptance|accepted]] in Britain. [[CiteRef::Barseghyan (2015)|p. 210]] The works of other experimental philosophers were also available to the young Hume. The natural philosophy library at Edinburgh, to which Hume is known to have contributed, contained an extensive collection of the works of Robert Boyle(1627-1691), the works of [[Rene Descartes]] (1596-1650), and [[John Locke]]'s (1632-1704) ''Essay Concerning Human Understanding''. This work, published in 1689, more than twenty years before Hume was born, propounded Locke's '''empiricist''' view of human knowledge. [[CiteRef::Harris (2015)|p. 38-40]][[CiteRef::Uzgalis (2016)]] Boyle, Newton, and Locke were all associated with the '''Royal Society of London''', which was founded in 1663, almost 50 years before Hume's birth, and sought to promote the experimental method and the new natural philosophy. [[CiteRef::Uzgalis (2016)]][[CiteRef::Rogers (1982)]]
By Hume's time, [[Aristotle]]'s (384 BC-322 BC) teleological account of causation had been rejected in favour of the '''corpuscular mechanistic''' view of causation. Derived from ancient atomism, it held that material bodies are made of invisibly small particles, called corpuscles. The only form of causation is mechanical, by direct physical contact of bodies or their constituent corpuscles. [[CiteRef::DePierris (2006)]] Natural philosophers continued to accept Aristotle's distinction between scientific knowledge and belief. Scientific knowledge was taken to be knowledge of causes and consisted of '''demonstrationdemonstrations'''; proving the necessary connection between cause and effect. Locke supported this view of knowledge and made the popular notion of a hypothetical hidden corpuscular microstructure and the associated notion of a metaphysically necessary connection between cause and effect central to his system. He nonetheless viewed demonstrative knowledge as seldom attainable because of the unobservability of corpuscles. [[CiteRef::DePierris (2006)]][[CiteRef::Kochiras (2014)]]
Although many early eighteenth century thinkers regarded Newton's theories and Locke's empiricism to constitute a unified system, there was a distinct tension between them, which Hume recognized. Newton had been unable to explain his gravitational force in terms of a corpuscular mechanism. He saw his inductive method as an alternative to the demands of a corpuscularism that stood in the way of the acceptance of a mathematically lawful gravitational force on its own terms. Hume's Newton inspired skepticism of speculative metaphysical hypotheses led him to reject corpuscularism, and his enthusiastic championing of Newton's inductive method led him to challenge Locke's concept of causation, and Aristotle's taxonomy of knowledge and opinion in favour of a new epistemic taxonomy and new concept of causation. [[CiteRef::Hume (1975)]][[CiteRef:: Morris and Brown (2016)]]
By the time he started work on ''A Treatise of Human Nature'' at the age of 23, Hume had become skeptical of religious belief. [[CiteRef:: Morris and Brown (2016)]] The term '''atheism''' was coined by Sir John Cheke almost two hundred years earlier in 1540, to refer to a lack of belief in divine providence. The term assumed its modern meaning of disbelief in the existence of God, as divine non-existence emerged as a disquieting possibility in the seventeenth century. [[CiteRef:: Hyman (2007)]] Descartes' rationalism had a proof of God's existence at its foundation, but it was also a challenge to the theological methodology established by Thomas Aquinas (1225-1274). This methodology stressed the limitations of human reason, and the necessity of reliance on divine revelation and the text of the Bible. Descartes instead stressed the human capacity to know God and nature through reason alone.
Descartes' rationalist argument for God's existence and guarantorship of the certainty of scientific knowledge was soon rejected as circular. [[CiteRef:: Hyman (2007)]][[CiteRef::Cottingham (1992)]] It was supplanted by Newton's experimental philosophy and Locke's empiricism, both of which stressed experience and observation as sources of the limited knowledge to which humans could aspire. It eschewed metaphysics and speculative hypotheses. [[CiteRef::Rogers (1982)]] Though they held non-standard beliefs, both Newton and Locke were nevertheless devoutly religious. Like many natural philosophers associated with the Royal Society, they rejected traditional rationalist proofs of God's existence and instead espoused the '''design argument''', supposing that the experimental method could demonstrate with probability that the universe was an artifact crafted by a cosmic Designer. Hume's ''Dialogues on Natural Theology'' (1779) was a response to such hopes, and was to raise devastating objections to them. Unlike Locke, Hume saw that empiricism must place God's existence among those speculative questions to be eschewed. [[CiteRef::Hyman (2007)]] Doubts about God's existence also arose among French intellectuals in the mid-eighteenth century, with the first to openly proclaim himself an atheist being Denis Diderot (1713-1784). [[CiteRef:: Hyman (2007)]][[CiteRef::Bristow (2017)]]
|Major Contributions=Hume's main philosophical contributions were made via several works. The first was ''A Treatise of Human Nature'' published in three volumes in 1739 and 1740, when Hume was 29 years old. It sold poorly, and Hume lamented that the work fell "deadborn from the press". [[CiteRef::Morris and Brown (2016)|p. 4]] It is however, today regarded as a major and important work. Hume recast the material into two later publications, ''Enquiries concerning Human Understanding'', published in 1748, and ''concerning the Principles of Morals'' published in 1751. Because of its controversial nature, Hume had ''Dialogs concerning Natural Religion'' published posthumously in 1779, three years after his death. [[CiteRef::Morris and Brown (2016)]][[CiteRef:: Norton (2009)]]
=== Hume and Moral Philosophy ===
The basic goal of the first three of these works is indicated by the subtitle of the ''Treatise''; "an attempt to introduce the experimental method into moral subjects". [[CiteRef::Morris and Brown (2016)|p.7]] An admirer of the Newtonian experimental philosophy, Hume sought to extend it Newton's experimental philosophy from natural philosophy into what was then called '''moral philosophy''', which he defined as the "science of human nature". [[CiteRef::Morris and Brown (2016)|p.8]] The field of moral philosophy was much broader then than today, and included topics that we might classify as psychology or cognitive science, as well as epistemology. To Hume, an understanding of the workings of the mind was the key to establishing the foundations of all other knowledge, including "Mathematics, Natural Philosophy, and Natural Religion". [[CiteRef:: Norton (2009)|p. 34]] Natural philosophers, like Newton and Boyle, he maintains, had cured themselves of their "passion for hypotheses and systems". [[CiteRef:: Morris and Brown (2016)|p. 8-9]] Hume sought to work the same cure for moral philosophy, which he saw as full of speculative metaphysical hypotheses and constant dispute. [[CiteRef::Morris and Brown (2016)]] He proposed an empiricist alternative to ''a priori'' metaphysics and its speculative belief systems. He was a naturalist who rejected any appeal to the supernatural in explanations of human nature. For such beliefs, and because he argued that we cannot justify many of our beliefs, he is noted as a skeptic. But he also observed that we have non-rational faculties which compel certain sorts of beliefs (such as the belief that there is a world external to my mind of which my senses provide knowledge), and it is these faculties of which he wishes to give a positive descriptive account. [[CiteRef::Biro (2009)]]
Hume sought to found an empirical science of the mind, based on experience and observation. He noted that the application of the experimental method to "moral subjects" necessarily differed from its use in natural philosophy, because it was impossible to conduct experiments "purposely, with premeditation". Instead, knowledge would be gained "from cautious observation of human life...by men's behaviour in company, in affairs, and in pleasures". [[CiteRef::Biro (2009)|p. 42]] Experimental psychology in the modern sense, with controlled experiments in the laboratory, would not make its appearance until the late 19th century. [[CiteRef::Leary (1979)]]
By the time Hume started work on his ''Treatise'' the notion that an idea was the primary sort of mental content dominated European philosophy, due , in part , to the works of Descartes and Locke. Hume instead used the term ''''perceptions'''' to designate mental content of any sort. He supposed there are two sorts of perceptions, '''impressions''' and '''ideas''', which was a new distinction. Impressions include feelings we get from our senses, such as of a red tomato currently in front of me, as well as desires, emotions, passions, and sentiments, such as my current hunger for the tomato. Hume distinguished impressions from ideas by their degree of vivacity or force. Thus, I have an impression of the tomato that is currently present, and an idea of a tomato I ate last week. Hume supposed our ideas are faint copies of our impressions. [[CiteRef::Owen (2009)]][[CiteRef::Morris and Brown (2016)]][[CiteRef::Biro (2009)]]
Noting that there is a regular order to our thoughts, he asserted that the mind has the power to associate ideas. Hume’s concepts about the association of ideas were novel. He posited three associative principles; '''resemblance''' (as when I recognize that the tomato currently before me resembles the one in my garden), '''contiguity''' in time and place (as when I notice that the tomato is on the table to my left) and '''causation''' (as when I notice that bumping the table causes the tomato to tumble to the floor). Hume believed that by thus anatomizing human nature, its laws of operation could be discovered. [[CiteRef::Morris and Brown (2016)]][[CiteRef::Biro (2009)]] [[CiteRef::Owen (2009)]] Hume argued that the mind could not be an immaterial substance, though he was also critical of materialism. Regarding personal identity, he wrote that “what we call a ''mind'' is nothing but a heap or collection of different perceptions, united together by certain relations, and supos’d, tho’ falsly, to be endow’d with perfect simplicity and identity”. [[CiteRef::McIntyre (2009) | p. 182]] It was Hume's careful analysis of the mind that led to insights relevant to scientific methodology.
