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- 'Statements of fact' ('positive' or 'descriptive statements'), based upon reason and physical observation, and which are examined via the empirical method.
- 'Statements of value' ('normative' or 'prescriptive statements'), which encompass ethics and aesthetics, and are studied via axiology.
This barrier between 'fact' and 'value' implies it is impossible to derive ethical claims from factual arguments, or to defend the former using the latter.
The fact–value distinction is closely related to, and derived from, the is–ought problem in moral philosophy, characterized by David Hume (1711–1776). The terms are often used interchangeably, though philosophical discourse concerning the is–ought problem does not usually encompass aesthetics.
David Hume's skepticism
In 'A Treatise of Human Nature' (1739), David Hume discusses the problems in grounding normative statements in positive statements, that is, in deriving ought from is. It is generally regarded that Hume considered such derivations untenable, and his 'is–ought' problem is considered a principal question of moral philosophy.
Hume shared a political viewpoint with early Enlightenment philosophers such as Thomas Hobbes (1588–1679) and John Locke (1632–1704). Specifically, Hume, at least to some extent, argued that religious and national hostilities that divided European society were based on unfounded beliefs. In effect, Hume contended that such hostilities are not found in nature, but are a human creation, depending on a particular time and place, and thus unworthy of mortal conflict.
Prior to Hume, Aristotelian philosophy maintained that all actions and causes were to be interpreted teleologically. This rendered all facts about human action examinable under a normative framework defined by cardinal virtues and capital vices. "Fact" in this sense was not value-free, and the fact-value distinction was an alien concept. The decline of Aristotelianism in the 16th century set the framework in which those theories of knowledge could be revised.
The fact–value distinction is closely related to the naturalistic fallacy, a topic debated in ethical and moral philosophy. G. E. Moore believed it essential to all ethical thinking. However, contemporary philosophers like Phillipa Foot have called into question the validity of such assumptions. Others, such as Ruth Anna Putnam, argue that even the most "scientific" of disciplines are affected by the "values" of those who research and practice the vocation. Nevertheless, the difference between the naturalistic fallacy and the fact–value distinction is derived from the manner in which modern social science has used the fact–value distinction, and not the strict naturalistic fallacy to articulate new fields of study and create academic disciplines.
The fact–value distinction is also closely related to the moralistic fallacy, an invalid inference of factual conclusions from purely evaluative premises. For example, an invalid inference "Because everybody ought to be equal, there are no innate genetic differences between people" is an instance of the moralistic fallacy. As for the naturalistic fallacy one attempts to move from an "is" to an "ought" statement, with the moralistic fallacy one attempts to move from an "ought" to an "is" statement.
Nietzsche's table of values
Friedrich Nietzsche (1844–1900) in Thus Spoke Zarathustra said that a table of values hangs above every great people. Nietzsche points out that what is common among different peoples is the act of esteeming, of creating values, even if the values are different from one people to the next. Nietzsche asserts that what made people great was not the content of their beliefs, but the act of valuing. Thus the values a community strives to articulate are not as important as the collective will to act on those values. The willing is more essential than the intrinsic worth of the goal itself, according to Nietzsche. "A thousand goals have there been so far," says Zarathustra, "for there are a thousand peoples. Only the yoke for the thousand necks is still lacking: the one goal is lacking. Humanity still has no goal." Hence, the title of the aphorism, "On The Thousand And One Goals." The idea that one value-system is no more worthy than the next, although it may not be directly ascribed to Nietzsche, has become a common premise in modern social science. Max Weber and Martin Heidegger absorbed it and made it their own. It shaped their philosophical endeavor, as well as their political understanding.
Virtually all modern philosophers affirm some sort of fact–value distinction, insofar as they distinguish between science and "valued" disciplines such as ethics, aesthetics, or the fine arts. However, philosophers such as Hilary Putnam argue that the distinction between fact and value is not as absolute as Hume envisioned. Philosophical pragmatists, for instance, believe that true propositions are those that are useful or effective in predicting future (empirical) states of affairs. Far from being value-free, the pragmatists' conception of truth or facts directly relates to an end (namely, empirical predictability) that human beings regard as normatively desirable. Other thinkers reject an absolutist fact–value distinction by contending that our senses are imbued with prior conceptualizations, making it impossible to have any observation that is totally value-free, which is how Hume and the later positivists conceived of facts.
Several counterexamples have been offered by philosophers claiming to show that there are cases when an evaluative statement does indeed logically follow from a factual statement. A. N. Prior points out, from the statement "He is a sea captain," it logically follows, "He ought to do what a sea captain ought to do." Alasdair MacIntyre points out, from the statement "This watch is grossly inaccurate and irregular in time-keeping and too heavy to carry about comfortably," the evaluative conclusion validly follows, "This is a bad watch." John Searle points out, from the statement "Jones promised to pay Smith five dollars," it logically follows that "Jones ought to pay Smith five dollars." The act of promising by definition places the promiser under obligation.
Philippa Foot adopts a moral realist position, criticizing the idea that when evaluation is superposed on fact there has been a "committal in a new dimension". She introduces, by analogy, the practical implications of using the word "injury". Not just anything counts as an injury. There must be some impairment. When we suppose a man wants the things the injury prevents him from obtaining, haven’t we fallen into the old naturalist fallacy?
It may seem that the only way to make a necessary connexion between 'injury' and the things that are to be avoided, is to say that it is only used in an 'action-guiding sense' when applied to something the speaker intends to avoid. But we should look carefully at the crucial move in that argument, and query the suggestion that someone might happen not to want anything for which he would need the use of hands or eyes. Hands and eyes, like ears and legs, play a part in so many operations that a man could only be said not to need them if he had no wants at all.
Foot argues that the virtues, like hands and eyes in the analogy, play so large a part in so many operations that it is implausible to suppose that a committal in a non-naturalist dimension is necessary to demonstrate their goodness.
Philosophers who have supposed that actual action was required if 'good' were to be used in a sincere evaluation have got into difficulties over weakness of will, and they should surely agree that enough has been done if we can show that any man has reason to aim at virtue and avoid vice. But is this impossibly difficult if we consider the kinds of things that count as virtue and vice? Consider, for instance, the cardinal virtues, prudence, temperance, courage and justice. Obviously any man needs prudence, but does he not also need to resist the temptation of pleasure when there is harm involved? And how could it be argued that he would never need to face what was fearful for the sake of some good? It is not obvious what someone would mean if he said that temperance or courage were not good qualities, and this not because of the 'praising' sense of these words, but because of the things that courage and temperance are.
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- Väyrynen, Pekka (2019). Zalta, Edward N. (ed.). "Thick Ethical Concepts". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Retrieved 28 October 2019.
- Prior, AN (1960). The Autonomy of Ethics, Australasian Journal of Philosophy, 38(3): 199–206.
- Priest, Stephen (2007). The British Empiricists. Routledge. pp. 177–78. ISBN 978-0-415-35723-4.
- MacIntyre, Alasdair (2007). After Virtue (3rd ed.). Notre Dame: University of Notre Dame Press. p. 81–84.
- Casimir Lewy 1965 - G.E. Moore on the naturalistic fallacy
- Putnam, Ruth Anna. "Perceiving Facts and Values", Philosophy 73, 1998. JSTOR 3752124 This article as well as her earlier article, "Creating Facts and Values", Philosophy 60, 1985 JSTOR 3750998, examines how scientists may base their choice of investigations on their unexamined subjectivity, which undermines the objectivity of their hypothesis and findings
- Smart, J.C. "Ruth Anna Putnam and the Fact-Value Distinction", Philosophy 74, 1999. JSTOR 3751844
- Nietzsche, Friedrich. Thus Spoke Zarathustra. Book Two "On the Virtuous": "You who are virtuous still want to be paid! Do you want rewards for virtue, and heaven for earth, and the eternal for your today? And now you are angry with me because I teach that there is no reward and paymaster? And verily, I do not even teach that virtue is its own reward."
- Nietzsche, Friedrich. Thus Spoke Zarathustra. Book Four "On Old and New Tablets": "To redeem what is past in man and to recreate all 'it was' until the will says, 'Thus I willed it! Thus I shall will it!' - this I called redemption and this alone I taught them to call redemption."
- Putnam, Hilary. "The Collapse of the Fact/Value Dichotomy and Other Essays, Cambridge, MA : Harvard University Press, 2002" (PDF). Reasonpapers.com. Retrieved 2013-10-03.
- "Pragmatism (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. 2008-08-16. Retrieved 2013-10-03.
- Alasdair MacIntyre, After Virtue (1984), p. 57
- ibid., p. 68.
- Don MacNiven, Creative Morality, pp. 41–42.
- Philippa Foot, “Moral Beliefs,” Proceedings of the Aristotelian Society, vol. 59 (1958), pp. 83–104.
- Foot 1958, p. 96.
- Foot 1958, p. 97.
- Hume, David. A Treatise of Human Nature. 1739–1740.
- Hume, David. An Enquiry Concerning Human Understanding. 1748.
- Nietzsche, Friedrich. Thus Spoke Zarathustra. 1883–1891. Translated by R.J. Hollingdale. New York: Penguin, 1969.
- Putnam, Hilary. The Collapse of the Fact/Value Dichotomy and Other Essays. Harvard University Press, 2002. ISBN 0-674-01380-8
- Cushan, Anna-Marie. Investigation into Facts and Values: Groundwork for a Theory of Moral Conflict Resolution. PhD thesis, Melbourne University, Ondwelle Publications (online): Melbourne, 1983/2014.
- Silvestri P. (ed.), L. Einaudi, On Abstract and Historical Hypotheses and on Value judgments in Economic Sciences, Critical edition with an Introduction and Afterword by Paolo Silvestri, Routledge, London - New York, 2017. DOI: https://doi.org/10.4324/9781315457932.