164 thinkers, books, and ideas connected to this field.
Non-dualist school of Hindu philosophy associated with Adi Shankaracharya holding that Brahman — pure consciousness — is the only reality, and that the individual self (Atman) is identical with Brahman.
American philosopher who translated Lorenz Puntel's major works into English and collaborated with him on extending the structural ontology to philosophy of religion.
David Bentley Hart's 2024 philosophical work — exploring panpsychism, consciousness, and the relationship between mind and nature — continuing his project of defending classical theism and the reality of consciousness against reductive materialism.
American philosopher working on fundamentality, the wave function as a physical ontology, and the philosophy of physics.
American philosopher who has developed easy ontology — a deflationary approach to metaphysics according to which existence questions can often be answered 'easily' by appeal to linguistic and conceptual facts.
Sri Lankan Tamil metaphysician and art historian who wrote The Dance of Shiva, The Transformation of Nature in Art, and Am I My Brother's Keeper — serving as the first scholar to make Indian and Islamic art accessible to the Western world and developing a metaphysical interpretation of art as the expression of universal principles.
Ancient Greek philosopher who posited Nous (Mind) as the principle that initiated the cosmic rotation separating opposites, and who argued that all natural substances contain portions of everything.
Ancient Greek philosopher from Miletus, student of Thales, who posited the apeiron — the indefinite or boundless — as the primordial principle from which all things come and to which they return.
Ancient Greek philosopher from Miletus who posited air as the primary substance, arguing that all things arise through condensation and rarefaction of air.
English philosopher who developed a vitalist monadological metaphysics — all things are spirit-matter monads capable of transformation — which influenced Leibniz's concept of monad.
Donald Davidson's theory that mental events are identical to physical events (monism) but that mental descriptions cannot be subsumed under physical laws (anomalism) — token identity without type identity.
Vedic sage and father of Shvetaketu, famous for the series of meditations in the Chandogya Upanishad culminating in 'tat tvam asi' (that thou art) — one of the four mahavakyas (great sayings) of Vedanta.
British philosopher who has developed a comprehensive account of the stream of consciousness and temporal experience — arguing that experience has intrinsic temporal extension.
American philosopher who has contributed to Humean metaphysics, the philosophy of quantum mechanics, and the Mentaculus account of the laws of nature and time's arrow.
Dutch philosopher — excommunicated from Amsterdam's Jewish community at 23 — author of the Ethics (written in geometric form) — who identified God with Nature (deus sive natura) and argued for determinism, the unity of substance, and the rational basis of freedom.
Dutch philosopher who developed a rigorous geometric metaphysics in which God and Nature are identical — the single infinite substance with infinite attributes — and derived a naturalistic ethics and liberal political theory.
Lorenz Puntel's extension of his structural ontology to the question of God — arguing that the systematic ontological framework implies the reality of an absolute Being.
The opening dialectic of Hegel's Science of Logic — Being and Nothing are identical in their indeterminacy; their unity and difference generates Becoming — the first movement of speculative logic.
Indian philosopher and grammarian who developed the philosophy of language as metaphysics — language (sabdabrahman) is the ultimate reality — and the sphota doctrine: the sentence as an indivisible unit of meaning.
Pre-Shankara Vedanta philosopher who held a bhedabheda (difference and non-difference) view — Brahman and the world are both different and non-different, a position Shankara criticized.
Vedanta philosopher who criticized Shankara's Advaita from a bhedabheda perspective, arguing that the world's difference from Brahman is real, not illusory.
The ultimate, impersonal reality or ground of being in Hindu philosophy — particularly in Advaita Vedanta, where Brahman is pure undifferentiated consciousness beyond all qualities.
Ancient Indian philosopher and teacher (Siddhartha Gautama) who founded Buddhism, teaching the Four Noble Truths about suffering and its cessation, the doctrine of no-self (anatta), and the Eightfold Path as the means of liberation.
Hume's view that the self is not a unified, persisting entity but merely a bundle of distinct perceptions — impressions and ideas — with no additional substrate.
Duplicate of ID 300. Traditional author of the Brahma Sutras — foundational text of Vedanta.
Aristotle's classification of the ten basic ways in which things can be said to be — substance, quantity, quality, relation, place, time, position, state, action, passion.
Song dynasty Neo-Confucian philosopher who co-founded with his brother Cheng Yi the school that placed li (principle) at the center of Neo-Confucian metaphysics.
Song dynasty Neo-Confucian philosopher who developed the concept of li (principle/pattern) as the metaphysical structure underlying all things and human moral nature — foundational for the Cheng-Zhu school.
German philosopher working on causation, persistence through time, and the metaphysics of time.
The I Ching (Classic of Changes) — one of the oldest of the Chinese classics, combining an ancient divination system of 64 hexagrams with philosophical commentary, influencing Confucian, Daoist, and Neo-Confucian thought for millennia.
Leibniz's doctrine that each individual substance has a complete concept — a concept that includes all predicates that are or will be true of that individual — which distinguishes substances from mere aggregates and grounds the principle of the identity of indiscernibles.
Ambitious book by David Chalmers arguing that all truths are a priori scrutable from a minimal base of physical, phenomenal, indexical, and that's-all truths.
British philosopher who has defended an A-theoretic account of time and worked on future contingents and temporal logic.
American metaphysician who introduced the trope theory of properties and argued for a four-dimensionalist (worm) theory of persistence and a deflationary account of temporal passage.
Australian philosopher working on essence, identity conditions, and the metaphysics of material objects.
The foundational text of Daoism, attributed to Laozi, consisting of 81 short chapters presenting the Dao as the ineffable source of all things and wu wei as the proper mode of human and political action.
Chinese philosophical tradition based on the Daodejing and Zhuangzi, emphasizing harmony with the Dao (the Way — the natural, spontaneous ordering of all things), non-action (wu wei), and the relativity of conventional distinctions.
Eastern Orthodox theologian and philosopher who writes with extraordinary literary brilliance — The Beauty of the Infinite, The Experience of God, That All Shall Be Saved, and a highly controversial New Testament translation — arguing for Christian universalism (all will be saved) and classical theism.
Australian philosopher who has worked on the philosophy of mind, metaphysics, and temporal experience.
Australian philosopher best known for formulating the hard problem of consciousness and developing two-dimensional semantics as a tool in philosophy of mind.
American philosopher who defended modal realism — the view that possible worlds are concrete, spatiotemporally isolated universes — and made foundational contributions to semantics, mind, and metaphysics.
British philosopher who has developed an influential defense of physicalism about mind and a broadly naturalistic philosophy of science.
American philosopher who has defended conventionalism about modal necessity — necessary truths are necessary because of linguistic convention, not mind-independent modal facts.
British philosopher who developed the sortal theory of identity and persistence — objects persist as the same only relative to a sortal concept — and has argued for a cognitivist view of ethics.
American metaphysician who has defended presentism and worked on God's relationship to time, material constitution, and persistence through change.
James Maffie's characterization of Aztec metaphysics as dialectical polar monism — reality is ultimately one (monism) but generates opposites (polar) that are in dynamic tension and transformation (dialectical).
Late Pre-Socratic philosopher who revived Anaximenes's air monism, arguing that all things are modifications of air and that air is divine intelligence.
René Descartes's autobiographical methodological manifesto presenting his four rules of method and containing a preliminary version of the cogito and the proofs of God's existence.
British metaphysician who developed a four-category ontology — individual substances, kinds (universal substances), attributes (universal properties), and modes (individual properties) — and argued for the coherence of non-Cartesian substance dualism.
American philosopher who has worked on divine omniscience, foreknowledge, and freedom — arguing for a sophisticated account of how God can know future free actions.
Ancient Greek philosopher who proposed a pluralist cosmology: all things are composed of four indestructible elements (fire, air, water, earth) combined and separated by the cosmic forces of Love (Philotes) and Strife (Neikos).
The collected philosophical treatises of Plotinus, edited and arranged by his student Porphyry into six groups of nine (enneads), constituting the foundational text of Neoplatonism.
Ancient Greek philosopher who founded Epicureanism — the pursuit of eudaimonia through ataraxia (tranquility) and aponia (absence of pain) — grounded in materialist atomism and the rejection of divine Providence.
Baruch Spinoza's masterwork written in geometric form — definitions, axioms, propositions, proofs — deriving metaphysics, philosophy of mind, theory of the emotions, and ethics from first principles about substance.
Dewey's major work in metaphysics — arguing for a naturalistic account of experience that dissolves traditional dualisms (mind/matter, fact/value, organism/environment).
Huston Smith's 1976 argument for the perennial philosophy — that the world's major religious traditions (Hindu, Buddhist, Jewish, Christian, Islamic, Indigenous) share a common metaphysical structure of hierarchically ordered levels of being (terrestrial, intermediate, celestial, infinite) that modern reductionist science has displaced.
Dutch-American philosopher who has worked on the metaphysics of space and time, causation, and the paradoxes of infinity.
Australian analytic philosopher who devised the knowledge argument against physicalism and co-developed conceptual analysis as a philosophical method.
German Idealist philosopher who developed Naturphilosophie (nature as objective spirit), the identity philosophy (subject and object are identical in the Absolute), and late in life a philosophy of mythology and revelation.
Frank Jackson's defense of conceptual analysis as the method linking ordinary discourse to serious metaphysics, arguing that philosophy must pass through conceptual claims before reaching ontological ones.
American philosopher who has defended the evidential authority of intuitions — intuitions are genuine evidence about the a priori — and developed a systematic account of mental properties as sui generis.
French philosopher who developed a philosophy of pure difference and immanence — difference not grounded in identity — drawing on Bergson, Spinoza, and Nietzsche, and co-created with Guattari the concepts of rhizome, assemblage, and deterritorialization.
German philosopher and mathematician who invented calculus independently, developed monadology — the view that reality consists of simple, immaterial, windowless monads — and argued this is the best of all possible worlds.
Wei-Jin dynasty philosopher who edited the Zhuangzi to its current form and developed a Neo-Daoist (xuanxue) interpretation arguing that things spontaneously self-create (zihua) without being caused by anything else.
Guatemalan-American philosopher who contributed to the theory of indexicals (quasi-indexicals) and developed guise theory — a comprehensive ontology of propositional attitudes.
English Cambridge Platonist philosopher who developed the concept of the spirit of nature — a lower providential agent in the world — and argued that space is the divine sensorium.
German philosopher — author of the Critique of Pure Reason, Groundwork of the Metaphysics of Morals, and Critique of Judgment — who created the Copernican Revolution in philosophy (that mind structures experience rather than simply receiving it) — whose categorical imperative is the most influential deontological ethics.
German-American philosopher working on conventionalism in metaphysics and the ontology of material objects.
British idealist philosopher who made the most influential contribution to the philosophy of time: the distinction between the A-series (past/present/future) and B-series (earlier/later-than), and the argument that time is ultimately unreal.
This is likely a reference to Ralph Cudworth, Cambridge Platonist philosopher who wrote The True Intellectual System of the Universe arguing against atheism and materialism.
American philosopher who worked on agent-relative obligations in deontic logic, the metaphysics of action, and edited the Philosophical Perspectives series.
American philosopher who has worked on Abelard's logic and metaphysics and on medieval accounts of substance and relation, defending a neo-medieval trope theory.
British-American philosopher who has contributed to epistemology (the lottery paradox, knowledge-how), metaphysics (four-dimensionalism, material objects), and philosophy of language.
British philosopher who has defended presentism about time and worked on truthmakers for tensed propositions.
American philosopher who became famous for the violinist thought experiment defending abortion rights and for developing the trolley problem into the central test case for deontological ethics.
Immanuel Kant — Prussian philosopher who wrote the Critique of Pure Reason (1781) — the most influential work in modern philosophy — who argued that the mind imposes structure on experience (space, time, causality are frameworks of the mind, not features of things in themselves), synthesizing rationalism and empiricism.
American philosopher who revived the notion of essence as real definition — distinct from modal necessity — developed the theory of grounding, and contributed to neo-logicism.
Central divine teacher of the Bhagavad Gita — the avatar of Vishnu who reveals the Gita's philosophical teachings to Arjuna on the battlefield of Kurukshetra.
Australian metaphysician who has worked on the nature of time, personal identity, and metaphysical methodology.
Austrian-American logician who proved the incompleteness theorems — any consistent formal system strong enough to express arithmetic contains true statements it cannot prove — transforming logic, philosophy of mathematics, and epistemology.
Semi-legendary Chinese philosopher traditionally credited as the author of the Daodejing and the founder of philosophical Daoism.
Thomas Hobbes's masterwork developing materialist psychology, the state of nature thought experiment, social contract theory, and the case for absolute sovereignty as the only alternative to civil war.
German philosopher who developed a comprehensive systematic ontology (Strukturontologie) arguing that Being as such — the absolutely universal dimension — is the subject matter of ontology and must be analyzed through a framework of structures.
Roman Epicurean philosopher and poet who wrote De Rerum Natura — the most sustained and beautiful Latin philosophical poem — presenting Epicurean atomism as a liberation from the fear of gods and death.
American philosopher who developed the constitution theory of material objects — objects are constituted by matter but not identical to it — and a non-reductionist account of persons.
English philosopher and author who developed a materialist vitalist natural philosophy — matter is self-moving and self-knowing — and wrote the first science fiction novel in English.
American metaphysician who has defended four-dimensionalism — persisting objects are extended through time as well as space — and worked on vagueness.
Scottish philosopher who provided a sophisticated critique of Hume's theory of causation, arguing that the concept of cause as necessary connection is demonstrably true, not a mere habit.
American philosopher who has worked on perceptual justification, the structure of epistemic reasons, and the relationship between knowledge and justification.
British-American analytic philosopher who contributed to the philosophy of language, logic, and metaphysics — famous for the thought experiment against Leibniz's principle of the identity of indiscernibles.
René Descartes's systematic philosophical work using methodological doubt to establish foundations of knowledge — cogito ergo sum, mind-body dualism, and proofs of God's existence.
Eleatic philosopher from Samos who extended Parmenides's monism — arguing that Being is one, eternal, unchanging, homogeneous, and spatially infinite (revising Parmenides's bounded sphere).
Donald Davidson's foundational paper arguing for anomalous monism — mental events are identical to physical events but mental descriptions cannot be systematically reduced to physical descriptions.
Aristotle's collection of lectures on first philosophy — the investigation of being qua being, substance, cause, form, matter, actuality, potentiality, and the unmoved mover.
Avicenna's Kitab al-Shifa (Book of the Remedy/Healing) — the most comprehensive philosophical encyclopedia of the medieval world, covering logic, natural science, mathematics, and metaphysics in the Aristotelian tradition.
British philosopher who developed anti-realism — the meaning of a statement is given by its assertibility conditions, not its truth conditions — and produced the authoritative scholarly interpretation of Frege.
Australian philosopher who has contributed to the analysis of causation, defended the A-theory of time, and argued for a permissive view of abortion.
Leibniz's 1714 metaphysical treatise articulating his monad theory — that the universe consists of infinite simple, indivisible substances (monads) that have no windows to each other but mirror the universe from their unique perspective — presented in 90 numbered paragraphs.
Saul Kripke's landmark work — originally a set of lectures — demolishing descriptivist theories of names and establishing the causal theory of reference and the necessity of identity.
French Oratorian philosopher who developed occasionalism — all apparent causation between finite things is mediated by God — as a response to Cartesian mind-body interaction.
American philosopher and one of the most prolific philosophers in history — over 100 books — who developed a pragmatic idealism arguing that knowledge is a practical achievement of mind in interaction with a mind-independent world.
The metaphysical position that only particular individual things exist — general terms (universals) are merely names (nomina) without corresponding real entities.
Greek philosophical concept meaning mind, intellect, or reason — used variously by Anaxagoras (as a cosmic ordering principle), Plato (as the highest faculty of the soul), Aristotle (as the active intellect), and Plotinus (as the second hypostasis in the emanation hierarchy).
Lucretius's six-book Latin poem presenting Epicurean atomism — the universe is atoms and void, the soul is mortal, the gods are indifferent — as the philosophical cure for religious terror.
David Lewis's extended defense of modal realism — the view that all possible worlds are equally real concrete universes — and its applications to the analysis of modality, counterfactuals, causation, properties, and propositions.
Aristotle's systematic account of the soul (psyche) as the first actuality of a natural body that has the potential for life — a hylomorphic theory that makes the soul the functional organization of a living body.
Ancient Greek philosopher from Elea who argued in verse that only being exists, non-being is inconceivable, and all apparent change and multiplicity is illusion — founding Western metaphysics' preoccupation with the one and the many.
British philosopher who developed minimalism about truth — the meaning of 'true' is exhausted by the Equivalence Schema — and has written on Wittgenstein, probability, and the nature of meaning.
American metaphysician who developed the Consequence Argument for incompatibilism about free will and an austere ontology of material beings — only simples and organisms, no tables or chairs.
Nozick's Philosophical Explanations (1981) is a wide-ranging philosophical work exploring knowledge, identity, free will, and the foundations of ethics through non-coercive philosophical argument.
Aristotle's systematic investigation of nature, motion, change, place, time, and the infinite — the foundational text of natural philosophy for over 1800 years.
Athenian philosopher — student of Socrates — founder of the Academy — author of 36 dialogues including The Republic, Symposium, Phaedo, and Meno — who created the Theory of Forms and whose vision of the philosopher-king defined Western political philosophy.
Egyptian-Roman philosopher who founded Neoplatonism — a systematic development of Plato synthesizing Aristotelian and Stoic elements — and whose Enneads describe an emanationist metaphysics culminating in mystical union with the One.
English philosopher and major Cambridge Platonist who wrote the most systematic refutation of atheistic materialism of the 17th century and developed a theory of plastic nature.
Hilary Putnam's work arguing against metaphysical realism and for internal realism, containing the famous brain-in-a-vat self-refutation argument.
French philosopher and mathematician who founded modern philosophy through radical methodological doubt, the cogito, and the substance dualism of mind and body.
Plato's masterwork — a dialogue in which Socrates and interlocutors investigate the nature of justice, concluding that justice in the city (philosopher-kings ruling warriors and producers) mirrors justice in the soul (reason ruling spirit and appetite) — while developing the theory of Forms, the allegory of the Cave, and the ideal city.
American philosopher who has developed a sophisticated divine command theory of ethics, a modal metaphysics of essences, and contributed to the study of Leibniz.
American philosopher who wrote the most influential philosophical defense of libertarianism, developed the tracking theory of knowledge, and made contributions across philosophy.
American philosopher who developed a possible worlds semantics for conditionals and a pragmatic theory of assertion based on common ground.
American philosopher who developed one of the most systematic internalist epistemologies and defended agent causation — the view that persons are irreducible causes distinct from event causation — in the theory of free will.
American philosopher who has developed an ameliorative approach to social ontology — analyzing what race and gender should mean to advance justice — and contributed to critical metaphysics.
Australian philosopher who has worked on mathematical explanation, the metaphysics of time, and time travel.
British theologian and rationalist philosopher who argued for the a priori knowability of moral obligations from the nature of things and conducted the famous correspondence with Leibniz on space, time, and God.
American philosopher and logician who revolutionized philosophy of language through modal logic semantics, the causal theory of names, and the distinction between necessity and apriority.
Plato's late dialogue in which the Eleatic Stranger attempts to define the sophist — leading to a radical revision of Parmenidean metaphysics and an account of how false statements are possible.
Hellenistic philosophical school founded by Zeno of Citium holding that virtue alone constitutes eudaimonia, that the universe is rational and providentially ordered, and that emotions contrary to reason are errors of judgment.
Canadian philosopher who developed a branching-universe model of objective becoming — the actual future is selected by a process of branch attrition as possibilities are eliminated.
Lorenz Puntel's systematic ontology presenting a comprehensive theory of structures — logical, ontological, alethic, and modal — constituting Being as such.
Anaximander's concept of the apeiron — the indefinite, boundless, or unlimited — as the primary source from which all definite things emerge and into which they return.
McTaggart's two-volume systematic metaphysics, arguing that only spirits and their love-relations truly exist — matter and time are appearances.
In Neoplatonism, the One is the first hypostasis — the absolute, ineffable source from which all being emanates — beyond all predication, thought, and being itself.
Anne Conway's posthumously published work arguing for a vitalist monism in which all creatures are composed of an intermediate spiritual substance capable of perfection and transformation.
William Egginton's 2023 book interweaving the thought of Kant, Borges, and Heisenberg — arguing that all three reached the same conclusion from different directions: that reality as we experience it is always a construction mediated by our cognitive and physical limitations, never the thing itself.
Ralph Cudworth's massive systematic work refuting atomistic atheism and defending Platonic theism, introducing the concept of plastic nature.
Arthur Schopenhauer's masterwork arguing that the world is fundamentally will — blind, insatiable striving — and that salvation from suffering comes through aesthetic contemplation and ascetic denial.
American philosopher of physics who has advocated for a robust metaphysics of the physical world — defending the reality of laws of nature, the arrow of time, and Bohmian quantum mechanics.
Plato's cosmological dialogue in which the Demiurge (a craftsman god) creates the physical universe by imposing mathematical form on a pre-existing receptacle (the chora), using the Forms as models.
British philosopher who developed the knowledge-first epistemology — knowledge is the most fundamental epistemic state, not analyzable into justified true belief — and has contributed to the logic of vagueness and modal epistemology.
An English-language introduction to Lorenz Puntel's systematic ontology co-authored with Alan White, presenting the core arguments of Structure and Being for an anglophone audience.
Ludwig Wittgenstein's early systematic work arguing that language pictures the logical structure of facts, and that what cannot be said — ethics, aesthetics, the mystical — must be passed over in silence.
American Jesuit philosopher who developed a relational Thomism — integrating Aquinas's act-of-being metaphysics with a personalist understanding of being as essentially self-communicating.
Ming dynasty Neo-Confucian philosopher who developed the School of Mind (xinxue) — mind is the ultimate reality — and the unity of knowledge and action: genuine knowledge necessarily issues in action.
American philosopher who made seminal contributions to the critique of the given, the nature of semantic concepts, and the relationship between the scientific and manifest images of the world — widely regarded as one of the most important American philosophers of the 20th century.
Xenocrates was a Greek philosopher who led Plato's Academy after Speusippus and systematized Platonic doctrine by introducing the tripartite division of philosophy into logic, physics, and ethics.
Vedanta philosopher and early teacher of Ramanuja who held a bhedabheda view — Ramanuja later rejected his teacher's position in favor of Vishishtadvaita.
Cypriot-Greek philosopher who founded Stoicism after studying in Athens, teaching in the Stoa Poikile — the Painted Porch — from which the school takes its name.
Song dynasty philosopher who synthesized Neo-Confucianism into its definitive systematic form — the Cheng-Zhu school — which became the orthodox interpretation of Confucianism for six centuries.
Classical Chinese Daoist philosopher and literary genius who developed a radical perspectivism — all perspectives are equally limited and partial — and a philosophy of spontaneous non-action (wu wei) and natural transformation.
Foundational Daoist philosophical text attributed to Zhuang Zhou, combining philosophical argument, parable, humor, and poetry to develop a perspectivism and naturalism that dissolves conventional distinctions.
German Idealism was a philosophical movement that emerged in the late 18th century, emphasizing the role of the mind in shaping our understanding of reality and knowledge.
The central concept of Aztec (Nahua) metaphysics — teotl is the single, dynamic, sacred force or energy that underlies and constitutes everything that exists, in a state of continuous motion and transformation.
French philosopher and historian of medieval philosophy who argued that Aquinas's central philosophical insight — the distinction between essence and the act of existing (esse) — constitutes the greatest contribution to Western metaphysics.
Philip Goff is a British philosopher at Durham University specializing in philosophy of mind, consciousness, and panpsychism. He is the leading contemporary defender of panpsychism — the view that consciousness is a fundamental and ubiquitous feature of the physical world — and has written several accessible books making the case for it.
British philosopher and author (1898-1997), a central figure in the Inklings alongside C.S. Lewis and J.R.R. Tolkien. Developed an original philosophy of consciousness evolution through the study of language history, drawing on Rudolf Steiner's anthroposophy. Lewis called him his wisest and best friend.
Philosophical metaphysical position — holding that reality is fundamentally mental, mind-dependent, or spiritual — that matter as naively conceived does not exist independently of mind or experience — ranging from Berkeley's subjective idealism to Kant's transcendental idealism to Hegel's absolute idealism to contemporary analytic idealism (Bernardo Kastrup).
Philosophical metaphysical position — holding that only matter (or physical processes) ultimately exists — that mind, consciousness, and all mental phenomena are either identical to, reducible to, or fully explicable by physical (brain) processes — the dominant metaphysical assumption of modern science and analytic philosophy.
Galen Strawson is a British philosopher (son of P.F. Strawson) at the University of Texas at Austin, known for his influential work on panpsychism, the self, free will, and moral responsibility. His 2006 paper 'Realistic Monism: Why Physicalism Entails Panpsychism' helped revive serious academic interest in panpsychism.
Russian-American occultist Helena Petrovna Blavatsky, co-founder of the Theosophical Society (1875). Her major works claimed contact with Mahatmas and synthesized Eastern religion with Western occultism, launching the modern spiritual movement known as Theosophy.
German Lutheran mystic and theosopher, the father of Christian theosophy. A shoemaker by trade, his visionary writings on God, nature, evil, and spiritual transformation launched a mystical current that runs through Western esotericism to the present day.
Neoplatonic metaphysical concept — developed most fully by Plotinus in the Enneads (3rd century CE) — describing reality as hierarchically flowing outward from the One (the ultimate unity) through Nous (divine intellect) and Soul into matter — the most influential non-creation metaphysics in Western philosophy.
Occult and esoteric concept — describing an autonomous psychic or spiritual entity created by the collective focused thought and emotion of a group — the idea that sufficiently intense collective belief, ritual, or attention generates a real (if non-physical) entity that can act back upon the group — popularized in 19th century French occultism and revived in contemporary chaos magic and Jungian discourse.
Philosophical position — holding that consciousness, experience, or proto-consciousness is a fundamental feature of all reality, not something that emerges solely in biological organisms — currently experiencing a major revival in analytic philosophy of mind as an alternative to physicalism and dualism.