David Hume book A Treatise of Human Nature
Part 1, Section 1
A Treatise of Human Nature (1739-40), Book 3: Of morals
David Hume was a Scottish philosopher, historian, economist, and essayist, who is best known today for his highly influential system of philosophical empiricism, skepticism, and naturalism.
Hume's empiricist approach to philosophy places him with John Locke, Francis Bacon, and Thomas Hobbes as a British Empiricist. Beginning with his A Treatise of Human Nature , Hume strove to create a total naturalistic science of man that examined the psychological basis of human nature. Against philosophical rationalists, Hume held that passion rather than reason governs human behaviour and argued against the existence of innate ideas, positing that all human knowledge is ultimately founded solely in experience; Hume thus held that genuine knowledge must either be directly traceable to objects perceived in experience, or result from abstract reasoning about relations between ideas which are derived from experience, calling the rest "nothing but sophistry and illusion", a dichotomy later given the name Hume's fork.
In what is sometimes referred to as Hume's problem of induction, he argued that inductive reasoning, and belief in causality cannot ultimately be justified rationally; our trust in causality and induction instead results from custom and mental habit, and are attributable to only the experience of "constant conjunction" rather than logic: for we can never, in experience, perceive that one event causes another, but only that the two are always conjoined, and to draw any inductive causal inferences from past experience first requires the presupposition that the future will be like the past, a presupposition which cannot be grounded in prior experience without already being presupposed. Hume's anti-teleological opposition to the argument for God's existence from design is generally regarded as the most intellectually significant such attempt to rebut the teleological argument prior to Darwin.
Hume was also a sentimentalist who held that ethics are based on emotion or sentiment rather than abstract moral principle, famously proclaiming that "Reason is, and ought only to be the slave of the passions". Some contemporary scholars view Hume's moral theory as a unique attempt to synthesize the modern sentimentalist moral tradition to which Hume belonged, with the virtue ethics tradition of ancient philosophy, with which Hume concurred in regarding traits of character, rather than acts or their consequences, as ultimately the proper objects of moral evaluation. Hume's moral theory maintained an early commitment to naturalistic explanations of moral phenomena, and is usually taken to have first clearly expounded the is–ought problem, or the idea that a statement of fact alone can never give rise to a normative conclusion of what ought to be done. Hume also influentially denied that humans have an actual conception of the self, positing that we experience only a bundle of sensations, and that the self is nothing more than this bundle of causally-connected perceptions. Hume's compatibilist theory of free will takes causal determinism as fully compatible with human freedom, and has proved extremely influential on subsequent moral philosophy.
While Hume was derailed in his attempts to start a university career by protests over his "atheism," and bemoaned that his literary debut, A Treatise of Human Nature, 'fell dead-born from the press', he nevertheless found literary success in his lifetime as an essayist, and a career as a librarian at the University of Edinburgh. His tenure there, and the access to research materials it provided, ultimately resulted in Hume's writing the massive six-volume The History of England, which became a bestseller and the standard history of England in its day. Hume described his "love for literary fame" as his "ruling passion" and judged his two late works, the so-called "first" and "second" enquiries, An Enquiry Concerning Human Understanding and An Enquiry Concerning the Principles of Morals, respectively, as his greatest literary and philosophical achievements, asking his contemporaries to judge him on the merits of the later texts alone, rather than the more radical formulations of his early, youthful work, dismissing his philosophical debut as juvenilia: "A work which the Author had projected before he left College." Nevertheless, despite Hume's protestations, a general consensus exists today that Hume's strongest and most important arguments, and most philosophically distinctive doctrines, are found in the original form they take in the Treatise, begun when Hume was just 23 years old, and now regarded as one of the most important works in the history of Western philosophy.
Hume has proved extremely influential on subsequent Western thought, especially on utilitarianism, logical positivism, William James, Immanuel Kant, the philosophy of science, early analytic philosophy, cognitive science, theology, and other movements and thinkers. Kant himself credited Hume as the spur to his philosophical thought who had awakened him from his "dogmatic slumbers". Contemporary philosophers have opined that "Hume, rivaled only by Darwin, has done the most to undermine in principle our confidence in arguments from design", that "No man has influenced the history of philosophy to a deeper or more disturbing degree", and that Hume's Treatise is "the founding document of Cognitive Science" and one of the most important philosophical works written in English. Arthur Schopenhauer once declared that "there is more to be learned from each page of David Hume than from the collected philosophical works of Hegel, Herbart and Schleiermacher taken together." Hume is thus widely regarded as a pivotal figure in the history of philosophical thought.

David Hume book A Treatise of Human Nature
Part 1, Section 1
A Treatise of Human Nature (1739-40), Book 3: Of morals
David Hume book A Treatise of Human Nature
Part 3, Section 16
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book A Treatise of Human Nature
Part 3, Section 8
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book A Treatise of Human Nature
Part 2, Section 2
A Treatise of Human Nature (1739-40), Book 3: Of morals
David Hume book An Enquiry Concerning Human Understanding
§ 8.27
An Enquiry Concerning Human Understanding (1748)
David Hume The Natural History of Religion
Part X - With regard to courage or abasement
The Natural History of Religion (1757)
David Hume book Of the Standard of Taste
David Hume, Of the Standard of Taste, 1760
Variant: The admirers and followers of the Alcoran insist on the excellent moral precepts interspersed through that wild and absurd performance. But it is to be supposed, that the Arabic words, which correspond to the English, equity, justice, temperance, meekness, charity were such as, from the constant use of that tongue, must always be taken in a good sense; and it would have argued the greatest ignorance, not of morals, but of language, to have mentioned them with any epithets, besides those of applause and approbation. But would we know, whether the pretended prophet had really attained a just sentiment of morals? Let us attend to his narration; and we shall soon find, that he bestows praise on such instances of treachery, inhumanity, cruelty, revenge, bigotry, as are utterly incompatible with civilized society. No steady rule of right seems there to be attended to; and every action is blamed or praised, so far only as it is beneficial or hurtful to the true believers.
David Hume The History of England
Volume V, Chapter LIV (Indianapolis: Liberty Fund, 1983), pp. 329-30; referring to the abolition of the Star Chamber
The History of England (1754-62)
“A propensity to hope and joy is real riches: One to fear and sorrow, real poverty.”
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 18: The Sceptic
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book A Treatise of Human Nature
Part 4, Section 7
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book An Enquiry Concerning Human Understanding
§ 4.11
An Enquiry Concerning Human Understanding (1748)
David Hume book A Treatise of Human Nature
Part 3, Section 16
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book Dialogues Concerning Natural Religion
Philo to Demea, Part V
Dialogues Concerning Natural Religion (1779)
David Hume book Dialogues Concerning Natural Religion
Philo to Cleanthes, Part II
Dialogues Concerning Natural Religion (1779)
David Hume book A Treatise of Human Nature
Part 1, Section 1
A Treatise of Human Nature (1739-40), Book 3: Of morals
David Hume book Dialogues Concerning Natural Religion
Demea to Philo, Part X
Dialogues Concerning Natural Religion (1779)
Letter to Henry Home (9 February 1848), quoted in J. Y. T. Greig, The Letters of David Hume: Volume I (Oxford: Clarendon Press, 1932), p. 111
David Hume book A Treatise of Human Nature
Part 1, Section 1
A Treatise of Human Nature (1739-40), Book 3: Of morals
“The role of reason is not to make us wise but to reveal our ignorance”
Commonly attributed to Hume, but without any apparent basis.
Misattributed
“Hypothetical liberty is allowed to everyone who is not a prisoner and in chains”
David Hume book An Enquiry Concerning Human Understanding
§ 8.23
An Enquiry Concerning Human Understanding (1748)
David Hume book A Treatise of Human Nature
Part 3, Section 16
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume The History of England
Volume III, Chapter LXI; referring to Oliver Cromwell
The History of England (1754-62)
“Character is the result of a system of stereotyped principles.”
Hume never used the word "stereotype" (the term was not invented until 1798).
Misattributed
David Hume book A Treatise of Human Nature
Part 4, Section 3
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
Statement to a friend shortly before his death, as recounted in Men of Letters by Lord Henry Brougham
David Hume The Natural History of Religion
Part X - With regard to courage or abasement
The Natural History of Religion (1757)
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 23: Of The Standard of Taste
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book An Enquiry Concerning Human Understanding
Of Liberty and Necessity, Part II (http://www.bartleby.com/37/3/12.html)
An Enquiry Concerning Human Understanding (1748)
Context: THERE is no method of reasoning more common, and yet none more blameable, than, in philosophical disputes, to endeavour the refutation of any hypothesis, by a pretence of its dangerous consequences to religion and morality. When any opinion leads to absurdities, it is certainly false; but it is not certain that an opinion is false, because it is of dangerous consequence. Such topics, therefore, ought entirely to be forborne; as serving nothing to the discovery of truth, but only to make the person of an antagonist odious.
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 8: Of Public Credit (This appears as a footnote in editions H to P. Other editions include it in the body of the text, and some number it Essay 9.)
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book An Enquiry Concerning Human Understanding
Section 12 : Of the Academical or Sceptical Philosophy Pt. 3
An Enquiry Concerning Human Understanding (1748)
David Hume book A Treatise of Human Nature
Part 1, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions
David Hume The Natural History of Religion
Part XV - General corollary
The Natural History of Religion (1757)
“Art may make a suit of clothes; but nature must produce a man.”
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 15: The Epicurean
Essays, Moral, Political, and Literary (1741-2; 1748)
E. C. Mossner, Life of David Hume (Clarendon Press, 2001), p. 311.
David Hume book An Enquiry Concerning Human Understanding
Section 10 : Of Miracles Pt. 2
An Enquiry Concerning Human Understanding (1748)
Letter 138, To Gilbert Elliot of Minto; August 9, 1757
David Hume book A Treatise of Human Nature
Part 3, Section 12
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 9: Of The Parties of Great Britain; final lines of this essay in the 1741 and 1742 editions of Essays, Moral and Political, they were not included in later editions.
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book Dialogues Concerning Natural Religion
Philo to Cleanthes, Part IV
Dialogues Concerning Natural Religion (1779)
David Hume book A Treatise of Human Nature
Part 4, Section 6
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 16: The Stoic
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book An Enquiry Concerning Human Understanding
§ 8.23
An Enquiry Concerning Human Understanding (1748)
David Hume The Natural History of Religion
Part XIV - Bad influence of popular religions on morality
The Natural History of Religion (1757)
David Hume book A Treatise of Human Nature
Part 2, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions
David Hume book A Treatise of Human Nature
Part 1, Section 4
A Treatise of Human Nature (1739-40), Book 2: Of the passions
David Hume book Dialogues Concerning Natural Religion
Pamphilus to Hermippus, Prologue
Dialogues Concerning Natural Religion (1779)
David Hume book An Enquiry Concerning Human Understanding
§ 4.8
An Enquiry Concerning Human Understanding (1748)
David Hume book Essays, Moral, Political, and Literary
Part I, Essay 22: Of the Standard of Taste
Essays, Moral, Political, and Literary (1741-2; 1748)
David Hume book Dialogues Concerning Natural Religion
Demea to Philo, Part X
Dialogues Concerning Natural Religion (1779)
David Hume book An Enquiry Concerning Human Understanding
§ 8.18
An Enquiry Concerning Human Understanding (1748)