“There is nothing in any object, consider'd in itself, which can afford us a reason for drawing a conclusion beyond it; […] even after the observation of the frequent or constant conjunction of objects, we have no reason to draw any inference concerning any object beyond those of which we have had experience.”
Part 3, Section 12
A Treatise of Human Nature (1739-40), Book 1: Of the understanding
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David Hume 138
Scottish philosopher, economist, and historian 1711–1776Related quotes

Source: Elements of Rhetoric (1828), p. 52-53

Source: An Introduction to Medical Literature, Including a System of Practical Nosology (1823), p. 5

“We do not draw objects as they are: we draw them as they seem to be.”
An Old Man's Thoughts on Many Things, Of Education I
Context: By drawing an object the children will also learn a fundamental doctrine of philosophy; but I don't recommend letting them know what the doctrine is. They will discover it some time. We do not draw objects as they are: we draw them as they seem to be. To the eye things are what they seem to be, but they are in reality, if you know what that means, something else.

"The Letter and the Spirit", in the journal Music and Letters, vol. 1 (1920) p. 88.

Letter to John Randolph (1 December 1803), published in The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 109 http://files.libertyfund.org/files/806/0054-10_Bk.pdf, pp. 54
1800s, First Presidential Administration (1801–1805)

Source: Propaganda & The Ethics Of Persuasion (2002), Chapter Six, Freedom Of Expression, p. 230

"On the Physiological Causes of Harmony" (1857), p. 81
Popular Lectures on Scientific Subjects (1881)
Context: As you are aware, no perceptions obtained by the senses are merely sensations impressed on our nervous systems. A peculiar intellectual activity is required to pass from a nervous sensation to the conception of an external object, which the sensation has aroused. The sensations of our nerves of sense are mere symbols indicating certain external objects, and it is usually only after considerable practice that we acquire the power of drawing correct conclusions from our sensations respecting the corresponding objects.

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), Later German Philosophy, p.170