Difference between revisions of "Ethical intuitionism" - New World Encyclopedia

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:''This article is about Intuitionism in mathematics and philosophical logic.  For other uses, see [[Ethical intuitionism]].''
 
  
In the [[philosophy of mathematics]], '''intuitionism''', or '''neointuitionism''' (opposed to [[preintuitionism]]), is an approach to [[mathematics]] as the constructive mental activity of humans. That is, they are not analytic activities wherein deep properties of existence are revealed and applied. Instead, logic and mathematics are the application of internally consistent methods to realize more complex mental constructs.
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'''Ethical intuitionism''' is usually understood as a [[Meta-ethics|meta-ethical]] theory that embraces the following theses:
  
== Truth and proof ==
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# [[Moral realism]], the view that there are [[Objectivity (philosophy)|objective]] facts about value,
In classical mathematics, mathematical statements assert something about truth. Intuitionism takes the truth of a mathematical statement to be equivalent to its having been proved; what other criteria can there be for truth, an intuitionist would argue, if mathematical objects are merely mental constructions? This means that an intuitionist may not believe that a mathematical statement has the same meaning that a classical [[mathematician]] would.  
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# [[Ethical non-naturalism]], the view that these evaluative facts cannot be reduced to natural facts, and
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# The thesis that we sometimes have [[Intuition (knowledge)|intuitive awareness]] of value, or intuitive knowledge of evaluative facts, which forms the foundation of our ethical knowledge.
  
For example, to claim an object with certain properties exists, is, to an intuitionist, to claim to be able to construct a certain object with those properties. Any mathematical object is considered to be a product of a construction of a [[mind]], and therefore, the existence of an object is equivalent to the possibility of its construction. This contrasts with the classical approach, which states that the existence of an entity can be proved by refuting its non-existence. For the intuitionist, this is not valid; the refutation of the non-existence does not mean that it is possible to find a ''constructive'' proof of existence. As such, intuitionism is a variety of [[mathematical constructivism]]; but it is not the only kind.
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Sometimes the term "ethical intuitionism" is associated with a pluralistic, deontological position in [[normative ethics]], a position defended by [[W.D. Ross]].
  
As well, to say ''A'' [[logical disjunction|or]] ''B'', to an intuitionist, is to claim that either ''A'' or ''B'' can be ''proved''. In particular, the [[law of excluded middle]], ''A'' or [[negation|not]] ''A'', is disallowed since one cannot assume that it is always possible to either prove the statement ''A'' or its negation.  
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== The notion of intuition and the Moral Sense==
 +
Some intuitionists characterize "intuitions" as a species of beliefs, beliefs which are ''[[self-evidence|self-evident]]'' in the sense that they are justified simply by virtue of one's understanding of the proposition believed.
  
The interpretation of negation is also different. In classical logic, the negation of a statement asserts that the statement is ''false''; to an intuitionist, it means the statement is ''refutable'' (i.e., that there is a proof that there is no proof of it). The asymmetry between a positive and negative statement becomes apparent. If a statement ''P'' is provable, then it is certainly impossible to prove that there is no proof of ''P''; however, just because there is no proof that there is no proof of ''P'', we cannot conclude from this absence that there ''is'' a proof of ''P''. Thus ''P'' is a stronger statement than ''not-not-P''.
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Others characterize "intuitions" as a distinct kind of mental state, in which something ''seems'' to one to be the case (whether one believes it or not) as a result of intellectual reflection. All ethical intuitionists agree in characterizing intuitions as cognitive mental states that do not depend on observation or inference.
  
[[Intuitionistic logic]] substitutes justification for truth in its logical calculus. The logical calculus preserves justification, rather than truth, across transformations yielding derived propositions. It has given philosophical support to several schools of philosophy, most notably the [[Anti-realism]] of [[Michael Dummett]].
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In early Intuitionist writing, moral intuitions were described as though they were produced by some independent sixth sense, called the ''"Moral Sense"'' - Allegedly, we apprehend rightness with our moral sense just as we apprehend colors with our visual sense. This was unsatisfactory, as we have no independent evidence there is such a sixth sense. If the ''moral sense'' were truly an independent sixth sense, why can we not sense the wrongness of a gross injustice that happens just out of sight? A better account became necessary.
  
Intuitionism also rejects the [[abstraction]] of [[actual infinity]]; i.e., it does not consider as given objects [[infinite]] entities such as the [[set]] of all [[natural number]]s or an arbitrary [[sequence]] of [[rational number]]s. This requires the reconstruction of the foundations of [[set theory]] and [[calculus]] as [[Constructive_set_theory|constructivist set theory]] and [[constructivist analysis]] respectively.
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== Analogy between perceiving moral and aesthetic truths ==
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Beauty is something we see in some faces, artworks and landscapes. We can also hear it in some pieces of music. We clearly do not need an independent aesthetic sense faculty to perceive beauty in the world. Our ordinary five senses are quite enough to observe it, though merely observing something beautiful is not by itself enough to appreciate its beauty. Suppose we give a name to this ability to appreciate the beauty in things we see: let’s call it the aesthetic sense. This aesthetic sense does not come automatically to all people with perfect vision and hearing, so it is fair to describe it as something extra, something not wholly reducible to vision and hearing.
  
== History of Intuitionism ==
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As the aesthetic sense informs us about what is beautiful, we can [[analogy|analogically]] understand the ''moral sense'' as informing us of what is good. People with a functioning moral sense get a clear impression of wrongness when they see puppies being kicked. However, though the wrongness is obvious, we may find it very difficult to list the features of the scene which account for the wrongness. We can figure out what features something needs to satisfy in order to be pudding; can likewise find the recipe for wrongness? We discover wrongness through observing natural properties with our five senses. Can we list the necessary and sufficient conditions such that any action which satisfies these conditions is wrong? The [[Ethical naturalism|Ethical Naturalist]] thinks that in principle, we can: For naturalists, rightness and wrongness are nothing more than certain combinations of natural, non-evaluative properties. Since we can in principle build mechanical detectors for all these natural properties, the [[Ethical naturalism|Ethical Naturalist]] thinks wrongness is something that a machine could eventually detect. The Intuitionist disagrees: They see a wide conceptual gap between [[Fact-Value Distinction|natural facts and evaluations]]. There seem to be no valid arguments in which purely descriptive/factual premises entail a prescriptive/evaluative conclusion. Intuitionists claim that only an agent with a moral sense can observe natural properties and through them discover the moral properties of the situation. Without the moral sense, you might see and hear all the colors and yelps, but the moral properties would remain hidden, and there would be in principle no way to ever discover them (unless someone else with a moral sense told you).
  
Intuitionist mathematics originated in part from (i) the strong disagreement between Cantor and his teacher [[Kronecker]] — a confirmed [[finitist]] — that led to Cantor's hospitalization, and (ii) the failure of [[Frege]]'s effort to reduce all of mathematics to a logical formulation — in face of the letter from [[Bertrand Russell]] received by Frege just as his life's work was about to be published. For more on these sad events see Davis (2000) Chapters 3 and 4: ''Frege: From Breakthrough to Despair'' and ''Cantor: Detour through Infinity''. See van Heijenoort for the original works and Heijenoort's excellent commentary.  
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For this reason, Intuitionists believe the interpretive moral sense is indispensable if we are to learn anything about moral truths.
  
In the early twentieth century the battle was taken up [[Brouwer]] the intuitionist versus [[Hilbert]] the [[logicist]] — see van Heijenoort. [[Kurt Gödel]] the [[Platonist]] had his opinions (see various sources re Gödel) and even [[Alan Turing]] considers:
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== Objections to Ethical Intuitionism ==
:"non-constructive systems of logic with which not all the steps in a proof are mechanical, some being intuitive" (Turing (1939)'' Systems of Logic Based on Ordinals'' in Undecidable, p. 210)
 
  
In the middle of the century [[Kleene]] brought forth a more rational consideration of intuitionism in his ''Introduction to Meta-mathematics'' (1952).
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* '''Are there really objective moral values?'''
  
For the view that there are no paradoxes in Cantorian set theory — thus calling into question the program of intuitionist mathematics, see Alejandro Garciadiego's now-classic ''Bertrand Russell and the Origins of the Set-Theoretic Paradoxes''.
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Many people think that beauty is subjective, because it’s only in the eye of the beholder. They would claim there are really no objective facts about what is and is not beautiful, only facts about what people prefer. Because of the close analogies between the moral and the aesthetic sense, parity of reasoning suggests that we should see the difference between right and wrong as also being merely in the eye of the beholder. Though intuitionists insist on the analogy, they equally insist that the facts about right and wrong are perfectly objective. How can they have it both ways?
  
== Contributors to intuitionism ==
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*'''Disagreement'''
* [[Luitzen Egbertus Jan Brouwer|L. E. J. Brouwer]]
 
* [[Arend Heyting]]
 
* [[Stephen Kleene]]
 
* [[Michael Dummett]]
 
  
== Branches of intuitionistic mathematics ==
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The problem is made worse by the fact that there is so much widespread and apparently irresolveable disagreement about moral values. Why do these not get settled though the careful use of the moral sense? There are no long disputes about whether some object is green – these would be quickly settled if we just invited the disputing parties to look. Why does the moral sense not settle moral disagreements in a similarly simple way?
* [[Intuitionistic logic]]
 
* [[Intuitionistic arithmetic]]
 
* [[Intuitionistic type theory]]
 
* [[Intuitionistic set theory]]
 
* [[Intuitionistic analysis]]
 
  
== See also ==
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*'''Ockam’s Razor'''
* [[Anti-realism]]
 
* [[BHK interpretation]]
 
* [[Computability logic]]
 
* [[Curry-Howard isomorphism]]
 
* [[Foundations of mathematics]]
 
* [[Game semantics]]
 
* [[Intuition (knowledge)]]
 
* [[Ultraintuitionism]]
 
  
==Further reading==
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Finally, let’s consider the evidence we have for the existence of the moral sense: It is undeniable that some things “feel” right and wrong. But do these feelings really give us evidence that we are detecting an objective feature of the world, rightness and wrongness. When we feel queasy, we don’t postulate the existence of some independent feature of the world, Queas, which our queasy feelings supposedly detect. So why should feelings of deep injustice lead us to postulate some independent feature of the world called “wrongness”? The principle of Occam’s Razor requires us to postulate only those entities which are necessary to best explain our observations. The existence of queas and wrongness are not necessary to explain our queasy and resentful feelings. Thus we should say there is no such thing as wrongness, perhaps to pursue a program like [[Non-cognitivism|Emotivism]] to account for meanings of our sentences about wrongness.
  
* [[Jean van Heijenoort|van Heijenoort, J.]], ''From Frege to Gödel, A Source Book in Mathematical Logic, 1879-1931'', Harvard University Press, Cambridge, MA, 1967.  Reprinted with corrections, 1977.
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== History ==
 +
Ethical Intuitionism was popular in the early twentieth century, particularly among British analytic philosophers.
  
: * Luitzen Egbertus Jan [[Brouwer]], 1923, ''On the significance of the principle of excluded middle in mathematics, especially in function theory'' [reprinted with commentary, p. 334, van Heijenoort]
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[[Harold Arthur Prichard|H.A. Prichard]] gave an early defense of the view in his (1912) "Does Moral Philosophy Rest on a Mistake?", wherein he contended that moral philosophy rested chiefly on the desire to provide arguments starting from non-normative premises for the principles of obligation that we pre-philosophically accept, such as the principle that one ought to keep one's promises or that one ought not to steal.  This is a mistake, Prichard argued, both because it is impossible to derive any statement about what one ought to do from statements not concerning obligation (even statements about what is ''good''), and because there is no need to do so since common sense principles of moral obligation are self-evident.
  
: * Andrei Nikolaevich [[Kolmogorov]], 1925, ''On the princple of excluded middle'', [reprinted with commentary, p. 414, van Heijenoort]
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Prichard influenced [[G.E. Moore]], whose ''[[Principia Ethica]]'' (1903) argued famously that ''goodness'' was an indefinable, non-natural property of which we had intuitive awareness. Moore originated the term "[[naturalistic fallacy|the naturalistic fallacy]]" to refer to the (alleged) error of confusing goodness with some natural property, and he deployed the Open Question Argument to show why this was an error. Unlike Prichard, Moore thought that one could derive principles of obligation from propositions about what is good; Moore believed that what one ought to do is always determined by what will produce the most good.
  
: * Luitzen Egbertus Jan [[Brouwer]], 1927, ''On the domains of definitons of functions'', [reprinted with commentary, p. 446, van Heijenoort]
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Ethical intuitionism suffered a dramatic fall from favor by the middle of the century, probably due in part to the influence of [[logical positivism]], in part to the rising popularity of [[Naturalism (philosophy)|naturalism]] in philosophy, and in part to philosophical objections based on the phenomenon of widespread moral disagreement.
::Although not directly germane, in his (1923) Brouwer uses certain words defined in this paper.
 
 
: * Luitzen Egbertus Jan [[Brouwer]], 1927(2), ''Intuitionistic reflections on formalism'', [reprinted with commentary, p. 490, van Heijenoort]
 
  
: * Jacques Herbrand, (1931b), "On the consistency of arithmetic", [reprinted with commentary, p. 618ff, van Heijenoort]
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Some recent work suggests the view may be enjoying a resurgence of interest in academic philosophy. [[Robert Audi]] is one of the main supporters of intuitionism in our days. His [[2005]] book, ''The Good in the Right'', claims to update and strengthen Rossian intuitionism and to develop the epistemology of ethics. Authors writing on [[normative ethics]] often accept ''methodological intuitionism'' as they present allegedly obvious or intuitive examples or [[thought experiment]]s as support for their theories.
:: From van Heijenoort's commentary it is unclear whether or not Herbrand was a true "intuitionist"; Gödel (1963) asserted that indeed "...Herbrand was an intuitionist". But van Heijenoort says Herbrand's conception was "on the whole much closer to that of Hilbert's word 'finitary' ('finit') that to "intuitionistic" as applied to Brouwer's doctrine".
 
  
*[[Arend Heyting]]: {{cite book | first=Arend | last=Heyting | title=Intuitionism: An Introduction | publisher=North-Holland Pub. Co | location=Amsterdam | origyear=1956 | year=1971 | edition=3d rev. ed. | id=ISBN 0-7204-2239-6}}
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== Further reading ==
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Following are some important works by ethical intuitionists.
  
*{{cite book | first=Dennis E. | last=Hesseling | title=Gnomes in the Fog. The Reception of Brouwer's Intuitionism in the 1920s | publisher=Birkhäuser | year=2003 | id=ISBN 3-7643-6536-6}}
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* [[G.E. Moore]], ''Principia Ethica'' (Cambridge University Press, 1903).
 
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* [[W.D. Ross]], ''The Right and the Good'' (Oxford: Clarendon Press, 1930).
* [[Paul Rosenbloom]], ''The Elements of Mathematical Logic'', Dover Publications Inc, Mineola, New York, 1950.
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* Michael Huemer, ''Ethical Intuitionism'' (Palgrave Macmillan, 2005).
:In a style more of Principia Mathematica — many symbols, some antique, some from German script. Very good discussions of intuitionism in the following locations: pages 51-58 in Section 4 Many Valued Logics, Modal Logics, Intuitionism; pages 69-73 Chapter III The Logic of Propostional Functions Section 1 Informal Introduction; and p. 146-151 Section 7 the Axiom of Choice.
 
 
 
*[[Stephen Cole Kleene]] and [[Richard Eugene Vesley]], ''The Foundations of Intuistionistic Mathematics'', North-Holland Publishing Co. Amsterdam, 1965. The lead sentence tells it all "The constructive tendency in mathematics...". A text for specialists, but written in Kleene's wonderfully-clear style.
 
 
 
*{{cite book | first=Stephen C. | last=[[Kleene]] | title=Introduction to Meta-Mathematics| publisher=North-Holland Pub. Co | location=Amsterdam NY| origyear=1952 | year=1991 | edition=Tenth impression 1991 | id=ISBN 0-7204-2103-9}}
 
:In Chapter III ''A Critique of Mathematic Reasoning, §11. The paradoxes'', Kleene discusses Intuitionism and [[Formalism]] in depth. Throughout the rest of the book he treats, and compares, both Formalist (classical) and Intuitionist logics with an emphasis on the former. Extraordinary writing by an extraordinary mathematician.
 
 
 
*"analysis." ''Encyclopædia Britannica''. 2006. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 15 June 2006, "[[Constructive analysis]]" ([[Ian Stewart]], author)
 
 
 
*[[W. S. Anglin]], ''Mathematics: A Concise history and Philosophy'', Springer-Verlag, New York, 1994.
 
:In ''Chapter 39 Foundations'', with respect to the 20th century Anglin gives very precise, short descriptions of  [[Platonism]] (with respect to Godel), [[Formalism]] (with respet to Hilbert), and Intuitionism (with respect to Brouwer).
 
 
 
*[[Constance Reid]], ''Hilbert'', Copernicus - Springer-Verlag, 1st edition 1970, 2nd edition 1996.
 
:Definitive biography of Hilbert places his "Program" in historical context together with the subsequent fighting, sometimes rancorous, between the Intuitionists and the Formalists.
 
 
 
*[[John W. Dawson]] Jr., ''Logical Dilemmas: The Life and Work of [[Kurt Gödel]]'', A. K. Peters, Wellesley, MA, 1997.
 
:Less readable than Goldstein but, in ''Chapter III Excursis'', Dawson gives an excellent "A Capsule History of the Development of Logic to 1928".
 
 
 
*[[Rebecca Goldstein]], ''Incompleteness: The Proof and Paradox of Kurt Godel'', Atlas Books, W.W. Norton, New York, 2005.
 
:In ''Chapter II Hilbert and the Formalists'' Goldstein gives further historical context. As a Platonist [[Gödel]] was reticent in the presence of the [[logical positivism]] of the Vienna Circle. She discusses [[Wittgenstein]]'s impact and the impact of the formalists. Goldstein notes that the intuitionists were even more opposed to [[Platonism]] than [[Formalism]].
 
 
 
=== Secondary References ===
 
 
 
*[[A. A. Markov]] (1954) ''Theory of algorithms''. [Translated by Jacques J. Schorr-Kon and PST staff] Imprint Moscow, Academy of Sciences of the USSR, 1954 [i.e. Jerusalem, Israel Program for Scientific Translations, 1961; available from the Office of Technical Services, U.S. Dept. of Commerce, Washington] Description 444 p. 28 cm. Added t.p. in Russian Translation of Works of the Mathematical Institute, Academy of Sciences of the USSR, v. 42. Original title: Teoriya algerifmov. [QA248.M2943 Dartmouth College library. U.S. Dept. of Commerce, Office of Technical Services, number OTS 60-51085.]
 
:A secondary reference for specialists: Markov opined that "The entire significance for mathematics of rendering more precise the concept of algorithm emerges, however, in connection with the problem of ''a constructive foundation for mathematics''....[p. 3, italics added.] Markov believed that further applications of his work "merit a special book, which the author hopes to write in the future" (p. 3). Sadly, said work apparently never appeared.
 
  
 
== External links ==
 
== External links ==
* [http://www.intuitionism.org/ Ten Questions about Intuitionism]
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* [http://home.sprynet.com/~owl1/book2.htm ''Ethical Intuitionism''], a contemporary defense of the theory.
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* [http://home.sprynet.com/~owl1/ethics.htm Papers defending intuitionism].
  
[[Category:Epistemology]]
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[[Category:Ethics]]
[[Category:Mathematical constructivism]]
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[[Category:Philosophy]]
 
[[Category:Philosophy and religion]]
 
[[Category:Philosophy and religion]]
  
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Revision as of 20:54, 21 January 2007


Ethical intuitionism is usually understood as a meta-ethical theory that embraces the following theses:

  1. Moral realism, the view that there are objective facts about value,
  2. Ethical non-naturalism, the view that these evaluative facts cannot be reduced to natural facts, and
  3. The thesis that we sometimes have intuitive awareness of value, or intuitive knowledge of evaluative facts, which forms the foundation of our ethical knowledge.

Sometimes the term "ethical intuitionism" is associated with a pluralistic, deontological position in normative ethics, a position defended by W.D. Ross.

The notion of intuition and the Moral Sense

Some intuitionists characterize "intuitions" as a species of beliefs, beliefs which are self-evident in the sense that they are justified simply by virtue of one's understanding of the proposition believed.

Others characterize "intuitions" as a distinct kind of mental state, in which something seems to one to be the case (whether one believes it or not) as a result of intellectual reflection. All ethical intuitionists agree in characterizing intuitions as cognitive mental states that do not depend on observation or inference.

In early Intuitionist writing, moral intuitions were described as though they were produced by some independent sixth sense, called the "Moral Sense" - Allegedly, we apprehend rightness with our moral sense just as we apprehend colors with our visual sense. This was unsatisfactory, as we have no independent evidence there is such a sixth sense. If the moral sense were truly an independent sixth sense, why can we not sense the wrongness of a gross injustice that happens just out of sight? A better account became necessary.

Analogy between perceiving moral and aesthetic truths

Beauty is something we see in some faces, artworks and landscapes. We can also hear it in some pieces of music. We clearly do not need an independent aesthetic sense faculty to perceive beauty in the world. Our ordinary five senses are quite enough to observe it, though merely observing something beautiful is not by itself enough to appreciate its beauty. Suppose we give a name to this ability to appreciate the beauty in things we see: let’s call it the aesthetic sense. This aesthetic sense does not come automatically to all people with perfect vision and hearing, so it is fair to describe it as something extra, something not wholly reducible to vision and hearing.

As the aesthetic sense informs us about what is beautiful, we can analogically understand the moral sense as informing us of what is good. People with a functioning moral sense get a clear impression of wrongness when they see puppies being kicked. However, though the wrongness is obvious, we may find it very difficult to list the features of the scene which account for the wrongness. We can figure out what features something needs to satisfy in order to be pudding; can likewise find the recipe for wrongness? We discover wrongness through observing natural properties with our five senses. Can we list the necessary and sufficient conditions such that any action which satisfies these conditions is wrong? The Ethical Naturalist thinks that in principle, we can: For naturalists, rightness and wrongness are nothing more than certain combinations of natural, non-evaluative properties. Since we can in principle build mechanical detectors for all these natural properties, the Ethical Naturalist thinks wrongness is something that a machine could eventually detect. The Intuitionist disagrees: They see a wide conceptual gap between natural facts and evaluations. There seem to be no valid arguments in which purely descriptive/factual premises entail a prescriptive/evaluative conclusion. Intuitionists claim that only an agent with a moral sense can observe natural properties and through them discover the moral properties of the situation. Without the moral sense, you might see and hear all the colors and yelps, but the moral properties would remain hidden, and there would be in principle no way to ever discover them (unless someone else with a moral sense told you).

For this reason, Intuitionists believe the interpretive moral sense is indispensable if we are to learn anything about moral truths.

Objections to Ethical Intuitionism

  • Are there really objective moral values?

Many people think that beauty is subjective, because it’s only in the eye of the beholder. They would claim there are really no objective facts about what is and is not beautiful, only facts about what people prefer. Because of the close analogies between the moral and the aesthetic sense, parity of reasoning suggests that we should see the difference between right and wrong as also being merely in the eye of the beholder. Though intuitionists insist on the analogy, they equally insist that the facts about right and wrong are perfectly objective. How can they have it both ways?

  • Disagreement

The problem is made worse by the fact that there is so much widespread and apparently irresolveable disagreement about moral values. Why do these not get settled though the careful use of the moral sense? There are no long disputes about whether some object is green – these would be quickly settled if we just invited the disputing parties to look. Why does the moral sense not settle moral disagreements in a similarly simple way?

  • Ockam’s Razor

Finally, let’s consider the evidence we have for the existence of the moral sense: It is undeniable that some things “feel” right and wrong. But do these feelings really give us evidence that we are detecting an objective feature of the world, rightness and wrongness. When we feel queasy, we don’t postulate the existence of some independent feature of the world, Queas, which our queasy feelings supposedly detect. So why should feelings of deep injustice lead us to postulate some independent feature of the world called “wrongness”? The principle of Occam’s Razor requires us to postulate only those entities which are necessary to best explain our observations. The existence of queas and wrongness are not necessary to explain our queasy and resentful feelings. Thus we should say there is no such thing as wrongness, perhaps to pursue a program like Emotivism to account for meanings of our sentences about wrongness.

History

Ethical Intuitionism was popular in the early twentieth century, particularly among British analytic philosophers.

H.A. Prichard gave an early defense of the view in his (1912) "Does Moral Philosophy Rest on a Mistake?", wherein he contended that moral philosophy rested chiefly on the desire to provide arguments starting from non-normative premises for the principles of obligation that we pre-philosophically accept, such as the principle that one ought to keep one's promises or that one ought not to steal. This is a mistake, Prichard argued, both because it is impossible to derive any statement about what one ought to do from statements not concerning obligation (even statements about what is good), and because there is no need to do so since common sense principles of moral obligation are self-evident.

Prichard influenced G.E. Moore, whose Principia Ethica (1903) argued famously that goodness was an indefinable, non-natural property of which we had intuitive awareness. Moore originated the term "the naturalistic fallacy" to refer to the (alleged) error of confusing goodness with some natural property, and he deployed the Open Question Argument to show why this was an error. Unlike Prichard, Moore thought that one could derive principles of obligation from propositions about what is good; Moore believed that what one ought to do is always determined by what will produce the most good.

Ethical intuitionism suffered a dramatic fall from favor by the middle of the century, probably due in part to the influence of logical positivism, in part to the rising popularity of naturalism in philosophy, and in part to philosophical objections based on the phenomenon of widespread moral disagreement.

Some recent work suggests the view may be enjoying a resurgence of interest in academic philosophy. Robert Audi is one of the main supporters of intuitionism in our days. His 2005 book, The Good in the Right, claims to update and strengthen Rossian intuitionism and to develop the epistemology of ethics. Authors writing on normative ethics often accept methodological intuitionism as they present allegedly obvious or intuitive examples or thought experiments as support for their theories.

Further reading

Following are some important works by ethical intuitionists.

  • G.E. Moore, Principia Ethica (Cambridge University Press, 1903).
  • W.D. Ross, The Right and the Good (Oxford: Clarendon Press, 1930).
  • Michael Huemer, Ethical Intuitionism (Palgrave Macmillan, 2005).

External links

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