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William of Ockham, OFM (; also Occam, from la, Gulielmus Occamus; 1287 – 10 April 1347) was an English
Franciscan friar , image = FrancescoCoA PioM.svg , image_size = 200px , caption = A cross, Christ's arm and Saint Francis's arm, a universal symbol of the Franciscans , abbreviation = OFM , predecessor = , ...
, scholastic
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
,
apologist Apologetics (from Greek , "speaking in defense") is the religious discipline of defending religious doctrines through systematic argumentation and discourse. Early Christian writers (c. 120–220) who defended their beliefs against critics and ...
, and
Catholic The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
theologian, who is believed to have been born in Ockham, a small village in
Surrey Surrey () is a ceremonial and non-metropolitan county in South East England, bordering Greater London to the south west. Surrey has a large rural area, and several significant urban areas which form part of the Greater London Built-up Area. ...
. He is considered to be one of the major figures of
medieval thought Medieval philosophy is the philosophy that existed through the Middle Ages, the period roughly extending from the fall of the Western Roman Empire in the 5th century until after the Renaissance in the 13th and 14th centuries. Medieval philosophy, ...
and was at the centre of the major intellectual and political controversies of the 14th century. He is commonly known for
Occam's razor Occam's razor, Ockham's razor, or Ocham's razor ( la, novacula Occami), also known as the principle of parsimony or the law of parsimony ( la, lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond neces ...
, the methodological principle that bears his name, and also produced significant works on
logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premises ...
,
physics Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which r ...
and
theology Theology is the systematic study of the nature of the divine and, more broadly, of religious belief. It is taught as an academic discipline, typically in universities and seminaries. It occupies itself with the unique content of analyzing the ...
. William is
remembered Recall in memory refers to the mental process of retrieval of information from the past. Along with encoding (memory), encoding and storage (memory), storage, it is one of the three core processes of memory. There are three main types of recall: ...
in the
Church of England The Church of England (C of E) is the established Christian church in England and the mother church of the international Anglican Communion. It traces its history to the Christian church recorded as existing in the Roman province of Britain ...
with a
commemoration Commemoration may refer to: *Commemoration (Anglicanism), a religious observance in Churches of the Anglican Communion *Commemoration (liturgy), insertion in one liturgy of portions of another *Memorialization *"Commemoration", a song by the 3rd a ...
on 10 April.


Life

William of Ockham was born in
Ockham, Surrey Ockham is a rural and semi-rural village in the borough of Guildford in Surrey, England. The village starts immediately east of the A3 but the lands extend to the River Wey in the west where it has a large mill-house. Ockham is between Cobham ...
in 1287. He received his elementary education in the London House of the Greyfriars. It is believed that he then studied theology at the
University of Oxford , mottoeng = The Lord is my light , established = , endowment = £6.1 billion (including colleges) (2019) , budget = £2.145 billion (2019–20) , chancellor ...
Spade, Paul Vincent (ed.). ''The Cambridge Companion to Ockham''. Cambridge University Press, 1999, p. 20.He has long been claimed as a Merton alumnus, but there is no contemporary evidence to support this claim and as a Franciscan, he would have been ineligible for fellowships at Merton (see G. H. Martin and J. R. L. Highfield, ''A History of Merton College'', Oxford: Oxford University Press, 1997, p. 53). The claim that he was a pupil of
Duns Scotus John Duns Scotus ( – 8 November 1308), commonly called Duns Scotus ( ; ; "Duns the Scot"), was a Scottish Catholic priest and Franciscan friar, university professor, philosopher, and theologian. He is one of the four most important ...
at Oxford is also disputed (see Philip Hughes, ''History of the Church: Volume 3: The Revolt Against The Church: Aquinas To Luther'', Sheed and Ward, 1979, p. 119 n. 2).
from 1309 to 1321, but while he completed all the requirements for a master's degree in theology, he was never made a
regent master Regent master (''Magister regens'') was a title conferred in the medieval universities upon a student who had acquired a master's degree. The degree meant simply the right to teach, the ''Licentia docendi'', a right which could be granted, in the ...
. Because of this he acquired the honorific title , or "Venerable Beginner" (an was a student formally admitted to the ranks of teachers by the university authorities). During the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
, theologian
Peter Lombard Peter Lombard (also Peter the Lombard, Pierre Lombard or Petrus Lombardus; 1096, Novara – 21/22 July 1160, Paris), was a scholastic theologian, Bishop of Paris, and author of '' Four Books of Sentences'' which became the standard textbook of ...
's ''
Sentences ''The Four Books of Sentences'' (''Libri Quattuor Sententiarum'') is a book of theology written by Peter Lombard in the 12th century. It is a systematic compilation of theology, written around 1150; it derives its name from the ''sententiae'' o ...
'' (1150) had become a standard work of theology, and many ambitious theological scholars wrote commentaries on it.Olson, Roger E. (1999). ''The Story of Christian Theology'', p. 350. William of Ockham was among these scholarly commentators. However, William's commentary was not well received by his colleagues, or by the Church authorities. In 1324, his commentary was condemned as unorthodox by a
synod A synod () is a council of a Christian denomination, usually convened to decide an issue of doctrine, administration or application. The word ''wikt:synod, synod'' comes from the meaning "assembly" or "meeting" and is analogous with the Latin ...
of bishops, and he was ordered to
Avignon Avignon (, ; ; oc, Avinhon, label=Provençal dialect, Provençal or , ; la, Avenio) is the Prefectures in France, prefecture of the Vaucluse Departments of France, department in the Provence-Alpes-Côte d'Azur Regions of France, region of So ...
, France, to defend himself before a papal court. An alternative understanding, recently proposed by George Knysh, suggests that he was initially appointed in Avignon as a professor of philosophy in the Franciscan school, and that his disciplinary difficulties did not begin until 1327. It is generally believed that these charges were levied by Oxford chancellor
John Lutterell John Lutterell (died 1335) was an English medieval philosopher, theologian, and university chancellor. Lutterell was a Dominican and a Canon of Salisbury Cathedral. He was Chancellor of Oxford University from 1317 to 1322. However, he was so di ...
. The
Franciscan Minister General Minister General is the term used for the leader or Superior General of the different branches of the Order of Friars Minor. It is a term exclusive to them, and comes directly from its founder, St. Francis of Assisi. He chose this word over "Super ...
,
Michael of Cesena Michael of Cesena (''Michele di Cesena'' or ''Michele Fuschi'') ( 1270 – 29 November 1342) was an Italian Franciscan, Minister General of that order, and theologian. His advocacy of evangelical poverty brought him into conflict with Pope ...
, had been summoned to Avignon, to answer charges of heresy. A theological commission had been asked to review his ''Commentary on the Sentences'', and it was during this that William of Ockham found himself involved in a different debate. Michael of Cesena had asked William to review arguments surrounding
Apostolic poverty Apostolic poverty is a Christian doctrine professed in the thirteenth century by the newly formed religious orders, known as the mendicant orders, in direct response to calls for reform in the Roman Catholic Church. In this, these orders attempted ...
. The Franciscans believed that
Jesus Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religious ...
and his
apostles An apostle (), in its literal sense, is an emissary, from Ancient Greek ἀπόστολος (''apóstolos''), literally "one who is sent off", from the verb ἀποστέλλειν (''apostéllein''), "to send off". The purpose of such sending ...
owned no property either individually or in common, and the
Rule of Saint Francis Francis of Assisi founded three orders and gave each of them a special rule. Here, only the rule of the first order is discussed, i.e., that of the Order of Friars Minor. Origin and contents of the rule Origin Whether St. Francis wrote several ...
commanded members of the order to follow this practice. This brought them into conflict with
Pope John XXII Pope John XXII ( la, Ioannes PP. XXII; 1244 – 4 December 1334), born Jacques Duèze (or d'Euse), was head of the Catholic Church from 7 August 1316 to his death in December 1334. He was the second and longest-reigning Avignon Pope, elected by ...
. Because of the pope's attack on the Rule of Saint Francis, William of Ockham,
Michael of Cesena Michael of Cesena (''Michele di Cesena'' or ''Michele Fuschi'') ( 1270 – 29 November 1342) was an Italian Franciscan, Minister General of that order, and theologian. His advocacy of evangelical poverty brought him into conflict with Pope ...
and other leading Franciscans fled Avignon on 26 May 1328, and eventually took refuge in the court of the
Holy Roman Emperor The Holy Roman Emperor, originally and officially the Emperor of the Romans ( la, Imperator Romanorum, german: Kaiser der Römer) during the Middle Ages, and also known as the Roman-German Emperor since the early modern period ( la, Imperat ...
Louis IV of Bavaria Louis IV (german: Ludwig; 1 April 1282 – 11 October 1347), called the Bavarian, of the house of Wittelsbach, was King of the Romans from 1314, King of Italy from 1327, and Holy Roman Emperor from 1328. Louis' election as king of Germany in ...
, who was also engaged in dispute with the papacy, and became William's patron. After studying the works of John XXII and previous papal statements, William agreed with the Minister General. In return for protection and patronage William wrote treatises that argued for Emperor Louis to have supreme control over church and state in the Holy Roman Empire. "On June 6, 1328, William was officially excommunicated for leaving Avignon without permission," and William argued that John XXII was a heretic for attacking the doctrine of Apostolic poverty and the Rule of Saint Francis, which had been endorsed by previous popes. William of Ockham's philosophy was never officially condemned as heretical. He spent much of the remainder of his life writing about political issues, including the relative authority and rights of the spiritual and temporal powers. After
Michael of Cesena Michael of Cesena (''Michele di Cesena'' or ''Michele Fuschi'') ( 1270 – 29 November 1342) was an Italian Franciscan, Minister General of that order, and theologian. His advocacy of evangelical poverty brought him into conflict with Pope ...
's death in 1342, William became the leader of the small band of Franciscan dissidents living in exile with Louis IV. William of Ockham died (prior to the outbreak of the plague) on 9 April 1347.


Philosophical thought

In
scholasticism Scholasticism was a medieval school of philosophy that employed a critical organic method of philosophical analysis predicated upon the Aristotelian 10 Categories. Christian scholasticism emerged within the monastic schools that translate ...
, William of Ockham advocated reform in both method and content, the aim of which was simplification. William incorporated much of the work of some previous theologians, especially
Duns Scotus John Duns Scotus ( – 8 November 1308), commonly called Duns Scotus ( ; ; "Duns the Scot"), was a Scottish Catholic priest and Franciscan friar, university professor, philosopher, and theologian. He is one of the four most important ...
. From Duns Scotus, William of Ockham derived his view of divine omnipotence, his view of grace and justification, much of his epistemology and ethical convictions. However, he also reacted to and against Scotus in the areas of predestination, penance, his understanding of universals, his formal distinction (that is, "as applied to created things"), and his view of parsimony which became known as
Occam's razor Occam's razor, Ockham's razor, or Ocham's razor ( la, novacula Occami), also known as the principle of parsimony or the law of parsimony ( la, lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond neces ...
.


Faith and reason

William of Ockham espoused
fideism Fideism () is an epistemological theory which maintains that faith is independent of reason, or that reason and faith are hostile to each other and faith is superior at arriving at particular truths (see natural theology). The word ''fideism'' c ...
, stating that "only faith gives us access to theological truths. The ways of God are not open to reason, for God has freely chosen to create a world and establish a way of salvation within it apart from any necessary laws that human logic or rationality can uncover." He believed that science was a matter of discovery and saw God as the only ontological necessity. His importance is as a theologian with a strongly developed interest in logical method, and whose approach was critical rather than system building.''The Oxford Companion to English Literature'', 6th Edition. Edited by
Margaret Drabble Dame Margaret Drabble, Lady Holroyd, (born 5 June 1939) is an English biographer, novelist and short story writer. Drabble's books include '' The Millstone'' (1965), which won the following year's John Llewellyn Rhys Memorial Prize, and ''Jer ...
, Oxford University Press, 2000, p. 735.


Nominalism

William of Ockham was a pioneer of
nominalism In metaphysics, nominalism is the view that universals and abstract objects do not actually exist other than being merely names or labels. There are at least two main versions of nominalism. One version denies the existence of universalsthings t ...
, and some consider him the father of modern
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 ...
, because of his strongly argued position that only individuals exist, rather than supra-individual
universals In metaphysics, a universal is what particular things have in common, namely characteristics or qualities. In other words, universals are repeatable or recurrent entities that can be instantiated or exemplified by many particular things. For exa ...
, essences, or forms, and that universals are the products of abstraction from individuals by the human mind and have no extra-mental existence. He denied the real existence of metaphysical universals and advocated the reduction of
ontology In metaphysics, ontology is the philosophical study of being, as well as related concepts such as existence, becoming, and reality. Ontology addresses questions like how entities are grouped into categories and which of these entities exis ...
. William of Ockham is sometimes considered an advocate of
conceptualism In metaphysics, conceptualism is a theory that explains universality of particulars as conceptualized frameworks situated within the thinking mind. Intermediate between nominalism and realism, the conceptualist view approaches the metaphysical co ...
rather than nominalism, for whereas nominalists held that universals were merely names, i.e. words rather than extant realities, conceptualists held that they were mental
concept Concepts are defined as abstract ideas. They are understood to be the fundamental building blocks of the concept behind principles, thoughts and beliefs. They play an important role in all aspects of cognition. As such, concepts are studied by s ...
s, i.e. the names were names of concepts, which do exist, although only in the mind. Therefore, the universal concept has for its object, not a reality existing in the world outside us, but an internal representation which is a product of the understanding itself and which "supposes" in the mind the things to which the mind attributes it; that is, it holds, for the time being, the place of the things which it represents. It is the term of the reflective act of the mind. Hence the universal is not a mere word, as
Roscelin Roscelin of Compiègne (), better known by his Latinized name Roscellinus Compendiensis or Rucelinus, was a French philosopher and theologian, often regarded as the founder of nominalism. Biography Roscellinus was born in Compiègne, France. Lit ...
taught, nor a ''sermo'', as
Peter Abelard Peter Abelard (; french: link=no, Pierre Abélard; la, Petrus Abaelardus or ''Abailardus''; 21 April 1142) was a medieval French scholastic philosopher, leading logician, theologian, poet, composer and musician. This source has a detailed desc ...
held, namely the word as used in the sentence, but the mental substitute for real things, and the term of the reflective process. For this reason William has sometimes also been called a "terminist", to distinguish him from a nominalist or a conceptualist. Others want to distinguish Ockham as a " Terminist" to distinguish him from both Nominalism and Conceptualism. William of Ockham was a theological voluntarist who believed that if God had wanted to, he could have become incarnate as a donkey or an ox, or even as both a donkey and a man at the same time. He was criticized for this belief by his fellow theologians and philosophers.


Efficient reasoning

One important contribution that he made to modern science and modern intellectual culture was efficient reasoning with the principle of parsimony in explanation and theory building that came to be known as
Occam's razor Occam's razor, Ockham's razor, or Ocham's razor ( la, novacula Occami), also known as the principle of parsimony or the law of parsimony ( la, lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond neces ...
. This maxim, as interpreted by
Bertrand Russell Bertrand Arthur William Russell, 3rd Earl Russell, (18 May 1872 – 2 February 1970) was a British mathematician, philosopher, logician, and public intellectual. He had a considerable influence on mathematics, logic, set theory, linguistics, ...
, states that if one can explain a phenomenon without assuming this or that hypothetical entity, there is no ground for assuming it, i.e. that one should always opt for an explanation in terms of the fewest possible causes, factors, or variables. He turned this into a concern for ontological parsimony; the principle says that one should not multiply entities beyond necessity——although this well-known formulation of the principle is not to be found in any of William's extant writings. He formulates it as: "For nothing ought to be posited without a reason given, unless it is self-evident (literally, known through itself) or known by experience or proved by the authority of Sacred Scripture." For William of Ockham, the only truly necessary entity is God; everything else is contingent. He thus does not accept the
principle of sufficient reason The principle of sufficient reason states that everything must have a reason or a cause. The principle was articulated and made prominent by Gottfried Wilhelm Leibniz, with many antecedents, and was further used and developed by Arthur Schopenhau ...
, rejects the distinction between essence and existence, and opposes the Thomistic doctrine of active and passive intellect. His scepticism to which his ontological parsimony request leads appears in his doctrine that human reason can prove neither the immortality of the soul; nor the existence, unity, and infinity of God. These truths, he teaches, are known to us by revelation alone.


Natural philosophy

William wrote a great deal on
natural philosophy Natural philosophy or philosophy of nature (from Latin ''philosophia naturalis'') is the philosophical study of physics Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior throu ...
, including a long commentary on Aristotle's ''Physics''. According to the principle of ontological parsimony, he holds that we do not need to allow entities in all ten of Aristotle's categories; we thus do not need the category of quantity, as the mathematical entities are not "real". Mathematics must be applied to other categories, such as the categories of substance or qualities, thus anticipating modern scientific renaissance while violating Aristotelian prohibition of ''metabasis''.


Theory of knowledge

In the theory of knowledge, William rejected the scholastic theory of species, as unnecessary and not supported by experience, in favour of a theory of abstraction. This was an important development in late medieval
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 ...
. He also distinguished between intuitive and abstract cognition; intuitive cognition depends on the existence or non-existence of the object, whereas abstractive cognition "abstracts" the object from the existence predicate. Interpreters are, as yet, undecided about the roles of these two types of cognitive activities.


Political theory

William of Ockham is also increasingly being recognized as an important contributor to the development of Western constitutional ideas, especially those of government with limited responsibility."William of Ockham"
''Stanford Encyclopedia of Philosophy''.
He was one of the first medieval authors to advocate a form of church/state separation, and was important for the early development of the notion of property rights. His political ideas are regarded as "natural" or "secular", holding for a secular absolutism. The views on monarchical accountability espoused in his ''Dialogus'' (written between 1332 and 1347) greatly influenced the
Conciliar movement Conciliarism was a reform movement in the 14th-, 15th- and 16th-century Catholic Church which held that supreme authority in the Church resided with an ecumenical council, apart from, or even against, the pope. The movement emerged in response to ...
and assisted in the emergence of liberal democratic ideologies. William argued for complete separation of spiritual rule and earthly rule. He thought that the pope and churchmen have no right or grounds at all for secular rule like having property, citing 2 Timothy 2:4. That belongs solely to earthly rulers, who may also accuse the pope of crimes, if need be.Virpi Mäkinen, ''Keskiajan aatehistoria'', Atena Kustannus Oy, Jyväskylä, 2003, , . Pages 160, 167–168, 202, 204, 207–209. After the
Fall Autumn, also known as fall in American English and Canadian English, is one of the four temperate seasons on Earth. Outside the tropics, autumn marks the transition from summer to winter, in September (Northern Hemisphere) or March (Souther ...
God had given men, including non-Christians, two powers: private ownership and the right to set their rulers, who should serve the interest of the people, not some special interests. Thus he preceded
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 ...
in formulating
social contract In moral and political philosophy Political philosophy or political theory is the philosophical study of government, addressing questions about the nature, scope, and legitimacy of public agents and institutions and the relationships betw ...
theory along with earlier scholars. William of Ockham said that the Franciscans avoided both private and common ownership by using commodities, including food and clothes, without any rights, with mere , the ownership still belonging to the donor of the item or to the pope. Their opponents such as
Pope John XXII Pope John XXII ( la, Ioannes PP. XXII; 1244 – 4 December 1334), born Jacques Duèze (or d'Euse), was head of the Catholic Church from 7 August 1316 to his death in December 1334. He was the second and longest-reigning Avignon Pope, elected by ...
wrote that use without any ownership cannot be justified: "It is impossible that an external deed could be just if the person has no right to do it." Thus the disputes on the heresy of Franciscans led William of Ockham and others to formulate some fundamentals of economic theory and the theory of ownership.


Logic

In
logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premises ...
, William of Ockham wrote down in words the formulae that would later be called
De Morgan's laws In propositional logic and Boolean algebra, De Morgan's laws, also known as De Morgan's theorem, are a pair of transformation rules that are both valid rules of inference. They are named after Augustus De Morgan, a 19th-century British mathem ...
, and he pondered
ternary logic In logic, a three-valued logic (also trinary logic, trivalent, ternary, or trilean, sometimes abbreviated 3VL) is any of several many-valued logic systems in which there are three truth values indicating ''true'', ''false'' and some indeterminate ...
, that is, a
logical system A formal system is an abstract structure used for inferring theorems from axioms according to a set of rules. These rules, which are used for carrying out the inference of theorems from axioms, are the logical calculus of the formal system. A form ...
with three
truth values In logic and mathematics, a truth value, sometimes called a logical value, is a value indicating the relation of a proposition to truth, which in classical logic has only two possible values (''true'' or '' false''). Computing In some progra ...
; a concept that would be taken up again in the
mathematical logic Mathematical logic is the study of logic, formal logic within mathematics. Major subareas include model theory, proof theory, set theory, and recursion theory. Research in mathematical logic commonly addresses the mathematical properties of for ...
of the 19th and 20th centuries. His contributions to
semantics Semantics (from grc, σημαντικός ''sēmantikós'', "significant") is the study of reference, meaning, or truth. The term can be used to refer to subfields of several distinct disciplines, including philosophy Philosophy (f ...
, especially to the maturing theory of
supposition Supposition theory was a branch of medieval logic that was probably aimed at giving accounts of issues similar to modern accounts of reference, plurality, tense, and modality, within an Aristotelian context. Philosophers such as John Buridan, W ...
, are still studied by logicians. William of Ockham was probably the first logician to treat empty terms in Aristotelian syllogistic effectively; he devised an empty term semantics that exactly fit the syllogistic. Specifically, an argument is valid according to William's semantics if and only if it is valid according to ''Prior Analytics''.


Theological thought


Church authority

William of Ockham denied
papal infallibility Papal infallibility is a dogma of the Catholic Church which states that, in virtue of the promise of Jesus to Peter, the Pope when he speaks ''ex cathedra'' is preserved from the possibility of error on doctrine "initially given to the aposto ...
and often went into conflict with the pope. However despite his conflicts with the papacy he did not renounce the
Roman Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
. Ockham also held that councils of the Church were fallible, he held that any individual could err on matters of faith, and councils being composed of multiple fallible individuals could err. He thus foreshadowed some elements of Luther's view of
sola scriptura , meaning by scripture alone, is a Christian theological doctrine held by most Protestant Christian denominations, in particular the Lutheran and Reformed traditions of Protestantism, that posits the Bible as the sole infallible source of au ...
.


Church and State

Ockham taught the
separation of church and state The separation of church and state is a philosophical and jurisprudential concept for d