Ethical intuitionism (also called moral intuitionism) is a view or family of views in moral
epistemology
Epistemology (; ), or the theory of knowledge, is the branch of philosophy concerned with knowledge. Epistemology is considered a major subfield of philosophy, along with other major subfields such as ethics, logic, and metaphysics.
Episte ...
(and, on some definitions,
metaphysics
Metaphysics is the branch of philosophy that studies the fundamental nature of reality, the first principles of being, identity and change, space and time, causality, necessity, and possibility. It includes questions about the nature of conscio ...
). It is
foundationalism
Foundationalism concerns philosophical theories of knowledge resting upon non-inferential justified belief, or some secure foundation of certainty such as a conclusion inferred from a basis of sound premises.Simon Blackburn, ''The Oxford Dictio ...
applied to moral knowledge, the thesis that some moral truths can be known non-inferentially (i.e., known without one needing to infer them from other truths one believes). Such an epistemological view is by definition committed to the existence of knowledge of moral truths; therefore, ethical intuitionism implies
cognitivism.
As a foundationalist epistemological position, ethical intuitionism contrasts with
coherentist
In philosophical epistemology, there are two types of coherentism: the coherence theory of truth; and the coherence theory of justification (also known as epistemic coherentism).
Coherent truth is divided between an anthropological approach, whic ...
positions in moral epistemology, such as those that depend on
reflective equilibrium
Reflective equilibrium is a state of balance or coherence among a set of beliefs arrived at by a process of deliberative mutual adjustment among general principles and particular judgements. Although he did not use the term, philosopher Nelson G ...
.
[Shafer-Landau & Cuneo (2012), p. 385]
Despite the name "ethical intuitionism", ethical intuitionists need not (though often do) accept that
intuitions of value (or of evaluative facts) form the foundation of ethical knowledge; the common commitment of ethical intuitionists is to a non-inferential foundation for ethical knowledge, regardless of whether such a non-inferential foundation consists in ''intuitions'' as such.
Throughout the philosophical literature, the term "ethical intuitionism" is frequently used with significant variation in its sense. This article's focus on foundationalism reflects the core commitments of contemporary self-identified ethical intuitionists.
[Stratton-Lake (2014) http://plato.stanford.edu/entries/intuitionism-ethics/]
Sufficiently broadly defined, ethical intuitionism can be taken to encompass cognitivist forms of
moral sense theory Moral sense theory (also known as moral sentimentalism) is a theory in moral epistemology and meta-ethics concerning the discovery of moral truths. Moral sense theory typically holds that distinctions between morality and immorality are discovered b ...
.
[Stratton-Lake (2013), p. 337] It is usually furthermore taken as essential to ethical intuitionism that there be
self-evident
In epistemology (theory of knowledge), a self-evident proposition is a proposition that is known to be true by understanding its meaning without proof, and/or by ordinary human reason.
Some epistemologists deny that any proposition can be self- ...
or ''
a priori
("from the earlier") and ("from the later") are Latin phrases used in philosophy to distinguish types of knowledge, justification, or argument by their reliance on empirical evidence or experience. knowledge is independent from current ...
'' moral knowledge; this counts against considering moral sense theory to be a species of intuitionism. (see the
Rational intuition versus moral sense section of this article for further discussion).
History
Early intuitionism
While there were ethical intuitionists in a broad sense at least as far back as
Thomas Aquinas
Thomas Aquinas, OP (; it, Tommaso d'Aquino, lit=Thomas of Aquino; 1225 – 7 March 1274) was an Italian Dominican friar and priest who was an influential philosopher, theologian and jurist in the tradition of scholasticism; he is known wi ...
, the philosophical school usually labelled as ethical intuitionism developed in Britain in the 17th and 18th centuries. Early intuitionists like
John Balguy,
Ralph Cudworth
Ralph Cudworth ( ; 1617 – 26 June 1688) was an English Anglican clergyman, Christian Hebraist, classicist, theologian
Theology is the systematic study of the nature of the divine and, more broadly, of religious belief. It is tau ...
, and
Samuel Clarke
Samuel Clarke (11 October 1675 – 17 May 1729) was an English philosopher and Anglican cleric. He is considered the major British figure in philosophy between John Locke and George Berkeley.
Early life and studies
Clarke was born in Norwich, ...
were principally concerned with defending
moral objectivism against the theories of
Thomas Hobbes
Thomas Hobbes ( ; 5/15 April 1588 – 4/14 December 1679) was an English philosopher, considered to be one of the founders of modern political philosophy. Hobbes is best known for his 1651 book ''Leviathan'', in which he expounds an influent ...
. Later, their views would be revived and developed by
Richard Price
Richard Price (23 February 1723 – 19 April 1791) was a British moral philosopher, Nonconformist minister and mathematician. He was also a political reformer, pamphleteer, active in radical, republican, and liberal causes such as the French ...
and pitted against the moral sense theory of
Francis Hutcheson, himself sometimes considered a sentimentalist intuitionist.
Immanuel Kant
Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and ...
's moral philosophy would be received in Britain as a German analog to Price, though according to
R. M. Hare
Richard Mervyn Hare (21 March 1919 – 29 January 2002), usually cited as R. M. Hare, was a British moral philosopher who held the post of White's Professor of Moral Philosophy at the University of Oxford from 1966 until 1983. He subseque ...
it is questionable whether Kant is an intuitionist.
Henry Sidgwick
In the 19th century, ethical intuitionism was considered by most British philosophers to be a philosophical rival of
utilitarianism
In ethical philosophy, utilitarianism is a family of normative ethical theories that prescribe actions that maximize happiness and well-being for all affected individuals.
Although different varieties of utilitarianism admit different charact ...
, until
Henry Sidgwick
Henry Sidgwick (; 31 May 1838 – 28 August 1900) was an English utilitarian philosopher and economist. He was the Knightbridge Professor of Moral Philosophy at the University of Cambridge from 1883 until his death, and is best known in philos ...
showed there to be several logically distinct theories, both normative and epistemological, sharing the same label. For Sidgwick, intuitionism is about intuitive, i.e. non-inferential, knowledge of moral principles, which are self-evident to the knower.
The criteria for this type of knowledge include that they are expressed in clear terms, that the different principles are mutually consistent with each other and that there is expert consensus on them. According to Sidgwick, commonsense moral principles fail to pass this test, but there are some more abstract principles that pass it, like that "what is right for me must be right for all persons in precisely similar circumstances" or that "one should be equally concerned with all temporal parts of one’s life".
The most general principles arrived at this way are all compatible with ''utilitarianism'', which is why Sidgwick sees a harmony between ''intuitionism'' and ''utilitarianism''.
There are also less general intuitive principles, like the duty to keep one's promises or to be just, but these principles are not universal and there are cases where different duties stand in conflict with each other. Sidgwick suggests that we resolve such conflicts in a utilitarian fashion by considering the consequences of the conflicting actions.
Inspired by Sidgwick, 20th century philosopher
C.D. Broad
Charlie Dunbar Broad (30 December 1887 – 11 March 1971), usually cited as C. D. Broad, was an English epistemologist, historian of philosophy, philosopher of science, moral philosopher, and writer on the philosophical aspects of psych ...
would coin the term "
deontological ethics
In moral philosophy, deontological ethics or deontology (from Greek: + ) is the normative ethical theory that the morality of an action should be based on whether that action itself is right or wrong under a series of rules and principles, ra ...
" to refer to the normative doctrines associated with intuitionism, leaving the phrase "ethical intuitionism" free to refer to the epistemological doctrines.
Intuitionism in analytic philosophy
Ethical intuitionism was popular in the early twentieth century, particularly among British analytic philosophers.
H.A. Prichard gave a defense of the view in his "Does Moral Philosophy Rest on a Mistake?" (1912), 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 was influenced by
G.E. Moore
George Edward Moore (4 November 1873 – 24 October 1958) was an English philosopher, who with Bertrand Russell, Ludwig Wittgenstein and earlier Gottlob Frege was among the founders of analytic philosophy. He and Russell led the turn from ideal ...
, whose ''
Principia Ethica
''Principia Ethica'' is a 1903 book by the British philosopher G. E. Moore, in which the author insists on the indefinability of "good" and provides an exposition of the naturalistic fallacy. ''Principia Ethica'' was influential, and Moore's a ...
'' (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.
W. D. Ross
Sir William David Ross (15 April 1877 – 5 May 1971), known as David Ross but usually cited as W. D. Ross, was a Scottish Aristotelian philosopher, translator, WWI veteran, civil servant, and university administrator. His best-known wor ...
's intuitionism was influenced both by Prichard and Moore. He holds that we can know moral truths through intuition, for example, that it is wrong to lie or that knowledge is intrinsically good.
Intuitions involve a direct apprehension that is not mediated by inferences or deductions: they are self-evident and therefore not in need of any additional proof.
This ability is not inborn but has to be developed on the way to reaching mental maturity.
But in its fully developed form, we can know moral truths just as well as we can know mathematical truths like the axioms of geometry or arithmetic.
This self-evident knowledge is limited to general principles: we can come to know the
prima facie duties
''Prima facie'' (; ) is a Latin expression meaning ''at first sight'' or ''based on first impression''. The literal translation would be 'at first face' or 'at first appearance', from the feminine forms of ''primus'' ('first') and ''facies'' (' ...
this way, e.g. that, generally speaking, one should keep one's promises and refrain from harming others.
But intuition is unable to reveal one's ''absolute'' duty in a particular situation: what one should do all things considered.
All we can do is consult perception to determine which prima facie duty has the highest normative weight in this particular case, even though this usually does not amount to knowledge proper due to the complexity involved in most specific cases.
Ethical intuitionism suffered a dramatic fall from favor by the middle of the century, due in part to the influence of
logical positivism
Logical positivism, later called logical empiricism, and both of which together are also known as neopositivism, is a movement in Western philosophy whose central thesis was the verification principle (also known as the verifiability criterion o ...
, in part to the rising popularity of
naturalism in philosophy, and in part to philosophical objections based on the phenomenon of widespread moral disagreement.
C. L. Stevenson's
emotivism
Emotivism is a meta-ethical view that claims that ethical sentences do not express propositions but emotional attitudes. Hence, it is colloquially known as the hurrah/boo theory. Influenced by the growth of analytic philosophy and logical positivi ...
would prove especially attractive to Moorean intuitionists seeking to avoid
ethical naturalism
Ethical naturalism (also called moral naturalism or naturalistic cognitivistic definism) is the meta-ethical view which claims that:
# Ethical sentences express propositions.
# Some such propositions are true.
# Those propositions are made true ...
. In the later parts of the 20th century, intuitionism would have few adherents to speak of; in
Bernard Williams
Sir Bernard Arthur Owen Williams, FBA (21 September 1929 – 10 June 2003) was an English moral philosopher. His publications include ''Problems of the Self'' (1973), ''Ethics and the Limits of Philosophy'' (1985), ''Shame and Necessity'' ...
' words: "This model of intuition in ethics has been demolished by a succession of critics, and the ruins of it that remain above ground are not impressive enough to invite much history of what happened to it."
[Williams (2011), p. 104]
Contemporary developments
Some recent work suggests the view may be enjoying a resurgence of interest in academic philosophy.
Robert Audi
Robert N. Audi (born November 1941) is an American philosopher whose major work has focused on epistemology, ethics (especially on ethical intuitionism), rationality and the theory of action. He is O'Brien Professor of Philosophy at the Universi ...
is one of the main contemporary supporters of ethical intuitionism. His 2005 book ''The Good in the Right'' claims to update and strengthen Rossian intuitionism and to develop the epistemology of ethics. Michael Huemer's book ''
Ethical Intuitionism
Ethical intuitionism (also called moral intuitionism) is a view or family of views in moral epistemology (and, on some definitions, metaphysics). It is foundationalism applied to moral knowledge, the thesis that some moral truths can be known no ...
'' (2005) also provides a recent defense of the view. Furthermore, authors writing on
normative ethics
Normative ethics is the study of ethical behaviour and is the branch of philosophical ethics that investigates the questions that arise regarding how one ought to act, in a moral sense.
Normative ethics is distinct from meta-ethics in that the ...
often accept ''methodological intuitionism'' as they present allegedly obvious or intuitive examples or
thought experiment
A thought experiment is a hypothetical situation in which a hypothesis, theory, or principle is laid out for the purpose of thinking through its consequences.
History
The ancient Greek ''deiknymi'' (), or thought experiment, "was the most anci ...
s as support for their theories.
Definitional issues
Because it was not until Sidgwick that it was clear there were several distinct theses sharing the label "ethical intuitionism", the term has developed many different connotations. This is liable to cause confusion; for example,
G.E. Moore
George Edward Moore (4 November 1873 – 24 October 1958) was an English philosopher, who with Bertrand Russell, Ludwig Wittgenstein and earlier Gottlob Frege was among the founders of analytic philosophy. He and Russell led the turn from ideal ...
's ''
Principia Ethica
''Principia Ethica'' is a 1903 book by the British philosopher G. E. Moore, in which the author insists on the indefinability of "good" and provides an exposition of the naturalistic fallacy. ''Principia Ethica'' was influential, and Moore's a ...
'' is often considered a ''locus classicus'' defense of ethical intuitionism, yet Moore explicitly refuses the label because of the large number of differences between his own views and traditional intuitionists.
Inessential connotations
Traditionally, intuitionism was often understood as having several other commitments:
#
Moral realism
Moral realism (also ethical realism) is the position that ethical sentences express propositions that refer to objective features of the world (that is, features independent of subjective opinion), some of which may be true to the extent that they ...
, the view that there are
objective
Objective may refer to:
* Objective (optics), an element in a camera or microscope
* ''The Objective'', a 2008 science fiction horror film
* Objective pronoun, a personal pronoun that is used as a grammatical object
* Objective Productions, a Brit ...
facts of morality (as held by Mark Platts).
#
Ethical non-naturalism
Ethical non-naturalism (or moral non-naturalism) is the meta-ethical view which claims that:
# Ethical sentences express propositions.
# Some such propositions are true.
# Those propositions are made true by objective features of the world, indep ...
, the view that these evaluative facts cannot be reduced to natural fact.
#
Classical foundationalism, i.e., the view that intuited moral beliefs are: infallible (indefeasible), indubitable (irresistibly compelling), incorrigible, certain, or understandable without reflection.
# The view that moral properties are "simple" (as held by G.E. Moore).
# The view that moral truths are knowable ''only ''by intuition.
However, none of these positions are essential to the view; most ethical intuitionists (such as
G.E. Moore
George Edward Moore (4 November 1873 – 24 October 1958) was an English philosopher, who with Bertrand Russell, Ludwig Wittgenstein and earlier Gottlob Frege was among the founders of analytic philosophy. He and Russell led the turn from ideal ...
and
W.D. Ross
WD may refer to:
Arts and entertainment
* ''The Walking Dead'' (TV series)
* ''White Dwarf'' (magazine)
Businesses and organizations Government agencies
* Royal Canadian Air Force Women's Division
* War Department (United Kingdom)
Ot ...
) simply happen to have held those views as well.
Furthermore, intuitionists are often understood to be essentially committed to the existence of a special
psychological faculty that reliably produces true moral intuitions.
Few intuitionists, however, have explicitly required such a faculty exist, and some, such as
Richard Price
Richard Price (23 February 1723 – 19 April 1791) was a British moral philosopher, Nonconformist minister and mathematician. He was also a political reformer, pamphleteer, active in radical, republican, and liberal causes such as the French ...
, would have explicitly denied it exists.
Pluralism
Secondly, sometimes the term "ethical intuitionism" is associated with a pluralistic,
deontological
In moral philosophy, deontological ethics or deontology (from Greek: + ) is the normative ethical theory that the morality of an action should be based on whether that action itself is right or wrong under a series of rules and principles, ra ...
position in
normative ethics
Normative ethics is the study of ethical behaviour and is the branch of philosophical ethics that investigates the questions that arise regarding how one ought to act, in a moral sense.
Normative ethics is distinct from meta-ethics in that the ...
, a position defended by most ethical intuitionists, with
Henry Sidgwick
Henry Sidgwick (; 31 May 1838 – 28 August 1900) was an English utilitarian philosopher and economist. He was the Knightbridge Professor of Moral Philosophy at the University of Cambridge from 1883 until his death, and is best known in philos ...
and
G.E. Moore
George Edward Moore (4 November 1873 – 24 October 1958) was an English philosopher, who with Bertrand Russell, Ludwig Wittgenstein and earlier Gottlob Frege was among the founders of analytic philosophy. He and Russell led the turn from ideal ...
being notable exceptions.
"Intuitivism"
Robert Audi (2004, Ch. 1) points out that in applied ethics, philosophers frequently appeal to intuitions to justify their claims, even though they do not call themselves intuitionists. Audi hence uses the label "intuitivists" to refer to people who are intuitionists without labeling themselves as such.
On this broad understanding of intuitionism, there are only a few ways someone doing moral philosophy might ''not ''count as an intuitionist. First, they might really refrain from relying on intuitions in moral philosophy altogether (say, by attempting to derive all moral claims from claims about what certain individuals desire). Second, they might deny foundationalism in favor of (say)
coherentism
In philosophical epistemology, there are two types of coherentism: the coherence theory of truth; and the coherence theory of justification (also known as epistemic coherentism).
Coherent truth is divided between an anthropological approach, whic ...
. Third, they might be non-cognitivists, holding that moral "beliefs" aren't really beliefs at all.
Rational intuition versus moral sense
Some use the term "ethical intuitionism" in moral philosophy to refer to the general position that we have some non-inferential moral knowledge (see Sinnott-Armstrong, 2006a and 2006b)—that is, basic moral knowledge that is not inferred from or based on any proposition. However, it is important to distinguish between empiricist versus rationalist models of this. Some, thus, reserve the term "ethical intuitionism" for the rationalist model and the term "moral sense theory" for the empiricist model (see Sinnott-Armstrong, 2006b, pp. 184–186, especially fn. 4). However, the terminology is not ultimately important, so long as one keeps in mind the relevant differences between these two views.
Generally speaking, rationalist ethical intuitionism models the acquisition of such non-inferential moral knowledge on ''a priori'', non-empirical knowledge, such as knowledge of mathematical truths; whereas moral sense theory models the acquisition of such non-inferential moral knowledge on empirical knowledge, such as knowledge of the colors of objects (see
moral sense theory Moral sense theory (also known as moral sentimentalism) is a theory in moral epistemology and meta-ethics concerning the discovery of moral truths. Moral sense theory typically holds that distinctions between morality and immorality are discovered b ...
).
Rational intuition
The rationalist version of ethical intuitionism models ethical intuitions on ''
a priori
("from the earlier") and ("from the later") are Latin phrases used in philosophy to distinguish types of knowledge, justification, or argument by their reliance on empirical evidence or experience. knowledge is independent from current ...
'', non-empirically-based intuitions of truths, such as basic truths of mathematics.
Take for example the belief that two minus one is one. This piece of knowledge is often thought to be non-inferential in that it is not grounded in or justified by some other proposition or claim. Rather, one who understands the relevant concepts involved in the proposition that two minus one is one has what one might call an "intuition" of the truth of the proposition. One intuits the truth of the proposition, rather than inferring it. Likewise, the ethical intuitionist claims that basic moral truths—whether they are principles (such as ''don't kill people'') or judgments (such as ''it is wrong to kill people'')—are known without inference, and in particular they are known via one's rational intuition.
Some rationalist ethical intuitionists characterize moral "intuitions" as a species of belief (for example, Audi, 2005, pp. 33–6) that are ''
self-evident
In epistemology (theory of knowledge), a self-evident proposition is a proposition that is known to be true by understanding its meaning without proof, and/or by ordinary human reason.
Some epistemologists deny that any proposition can be self- ...
'' in 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.
Michael Huemer
Michael Huemer (; born 27 December 1969) is a professor of philosophy at the University of Colorado, Boulder. He has defended ethical intuitionism, direct realism, libertarianism, veganism, and philosophical anarchism.
Education and career
H ...
(2005), for example, defines "intuition" as a sort of seeming:
Reasoning sometimes changes how things seem to us. But there is also a way things seem to us prior to reasoning; otherwise, reasoning could not get started. The way things seem prior to reasoning we may call an 'initial appearance'. An initial, ''intellectual'' appearance is an 'intuition'. That is, an intuition that ''p'' is a state of its seeming to one that ''p'' that is not dependent on inference from other beliefs and that results from thinking about ''p'', as opposed to perceiving, remembering, or introspecting. An ethical intuition is an intuition whose content is an evaluative proposition. (§5.2)
Regardless of one's definition of rational intuition, intuitionists all agree that rational intuitions are not justified by inference from a separate belief.
Moral sense
Another version—what one might call the
empiricist
In philosophy, empiricism is an epistemological theory that holds that knowledge or justification comes only or primarily from sensory experience. It is one of several views within epistemology, along with rationalism and skepticism. Empir ...
version—of ethical intuitionism models non-inferential ethical knowledge on sense perception. This version involves what is often called a "moral sense". According to moral sense theorists, certain moral truths are known via this moral sense simply on the basis of experience, not inference.
One way to understand the moral sense is to draw an analogy between it and other kinds of senses. Beauty, for example, 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 no guarantee that we can observe its beauty. In the same way, a
color-blind
Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. It can impair tasks such as selecting ripe fruit, choosing clothing, and reading traffic lights. Color blindness may make some aca ...
person is not necessarily able to perceive the green color of grass although he is capable of vision. Suppose we give a name to this ability to appreciate the beauty in things we see: one might 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, for example.
See also
Philosophers commonly identified as intuitionists
Books discussing intuitionism
Related philosophical concepts
Notes
Bibliography
* Audi, Robert (2004). ''The Good in the Right: A Theory of Intuition and Intrinsic Value'', Princeton University Press.
* Ardales, V.B. (1987). "Introductory Text to Philosophy", Quezon City: Greatbooks Trading Inc.
* Brink, David O. (1989). ''Moral Realism and the Foundations of Ethics'', Cambridge University Press.
* Deigh, John (2013). "Ethics in the Analytic Tradition" in ''The Oxford Handbook of the History of Ethics'' ed. Roger Crisp, Oxford University Press
* Hare, R.M (1997). ''Sorting Out Ethics'', Oxford University Press.
* Huemer, Michael (2005). ''Ethical Intuitionism'', Palgrave Macmillan.
* Louden, Robert B (1996). "Toward a Genealogy of 'Deontology'". Journal of the History of Philosophy 34:4. Johns Hopkins University Press.
* Mackie, J.L. (1977). ''Ethics: Inventing Right and Wrong''. Penguin.
* Moore, G.E. (1993). ''Principia Ethica'', revised edition, Cambridge University Press.
* Prichard, H.A. (1912).
Does Moral Philosophy Rest on a Mistake? ''
Mind
The mind is the set of faculties responsible for all mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will, and sensation. They are responsible for various m ...
'', N.S., Vol. 21.
* Ross, W.D. (1930). ''The Right and the Good'', Oxford: Clarendon Press.
* Shafer-Landau, Russ and Terence Cuneo, editors (2012). ''Foundations of Ethics: An Anthology.'' Blackwell Publishing.
* Sidgwick, Henry (1907). ''The Methods of Ethics'', Macmillan and Company, Ltd.
* Sidgwick, Henry (1931). ''Outlines of the History of Ethics'' 6th edition (enlarged), Macmillan and Company, Ltd.
* Stratton-Lake, Philip (2013). "Rational Intuitionism" in ''The Oxford Handbook of the History of Ethics'' ed. Roger Crisp, Oxford University Press.
* Stratton-Lake, Philip (2014).
Intuitionism in Ethics in ''Stanford Encyclopedia of Philosophy'', ed. E. Zalta.
*
* Sinnott-Armstrong, Walter (2006b). ''Moral Skepticisms'', Oxford University Press.
* Williams, Bernard (2011). ''Ethics and the Limits of Philosophy'', Routledge Classics
External links
*
Intuitionism in Ethicsat Stanford Encyclopedia of Philosophy
A Priorism in Moral Epistemologyat Stanford Encyclopedia of Philosophy
, a contemporary defense of the theory by Michael Huemer.
– by Michael Huemer.
{{DEFAULTSORT:Ethical Intuitionism
Meta-ethics
Ethical theories