# Idealism ## Intro Idealism is the position that the basic stuff of reality is *mental*, not material. The world is made of minds and ideas; matter is either a kind of dream, a presentation in a cosmic mind, or an appearance rather than an underlying reality. It is the opposite of materialism (which says everything is made of matter). The most famous version is George Berkeley's, in the early 1700s. Berkeley argued that "to be is to be perceived." The tree in the quad is real because God is always perceiving it; if no one were perceiving it, it would not exist. Material substance, the idea of stuff that exists independent of any mind, Berkeley argued was incoherent and unnecessary. Samuel Johnson kicked a stone and said "I refute him thus"; Berkeley would have said the kick is itself a mental event in a mental quad. Other versions: Plato's Forms (the truest reality is the realm of pure intelligible forms, not the changing material world), Hegel's Absolute Idealism (history is the unfolding of one cosmic Mind coming to know itself), and modern philosophical theist views like Bernardo Kastrup's analytic idealism (everything is in one universal consciousness). Christianity's relationship to idealism is mixed. Mainstream Christian metaphysics (Augustine, Aquinas, the Reformed tradition) is *realist*: the world is real, distinct, external, created by God but genuinely other than Him. A small theological-idealist strand (Jonathan Edwards, Gordon Clark) holds the world is continuously thought into being by God, so it is mental all the way down but in His mind, not ours. Both Christian options reject materialism. They differ on whether matter is real-but-derived or just-an-appearance-in-God's-mind. The interesting modern revival of idealism among scientists and philosophers (in response to the consciousness problem) gives Christianity a friendlier neighbor than materialism, even if mainstream Christian metaphysics does not go fully idealist. ## In full Idealism is the metaphysical view that reality is fundamentally *mental*, constituted by ideas, minds, or thought, rather than *material*. It is the historical foil to [Materialism](/codex/naturalism/) and distinct from [Naturalism](/codex/naturalism/) (some idealists are theists, others are not). Christian engagement with idealism is mixed: some strands (Jonathan Edwards, B. B. Warfield in places, Gordon Clark) embrace a *theological* idealism in which the world is sustained by God's continuous thought; mainstream Christian metaphysics (Aquinas, [Augustine](/codex/augustine/), the Reformed tradition broadly) affirms *realism*, the world is created by God but exists as a real, distinct, external reality. ## Definition / core claim The core idealist claim: the most fundamental kind of thing that exists is *mental*. Material objects either depend on minds for their existence (subjective idealism), are constituted by mental content in a cosmic mind (objective / theological idealism), or are appearances rather than things-in-themselves (transcendental idealism). Three theses commonly bundled with idealism: 1. **Mind is metaphysically prior** to matter, minds are not reducible to brains; matter (if real) is reducible to or dependent on mind. 2. **Esse est percipi** (Berkeley), to be is to be perceived; unperceived matter is incoherent. 3. **The intelligibility of reality** is grounded in its mental character, the cosmos is comprehensible because it is thought-like. ## Historical development - **[Plato](/codex/plato/)** (*Republic*, *Timaeus*, c. 380-360 BC), the Forms are the most real entities; sensory things are shadows. Often called the proto-idealist position. - **Plotinus** and **Neoplatonism** (3rd c. AD), emanationist hierarchy from the One through Intellect to Soul to Matter. - **George Berkeley** (*A Treatise concerning the Principles of Human Knowledge*, 1710; *Three Dialogues between Hylas and Philonous*, 1713), *subjective idealism*. Material substance is incoherent; physical objects are bundles of perceptions sustained by God's continuous perceiving. - **[Immanuel Kant](/codex/immanuel-kant/)** (*Critique of Pure Reason*, 1781), *transcendental idealism*. Space, time, and the categories are forms of intuition / understanding the mind imposes on a noumenal reality we cannot directly access. - **G. W. F. Hegel** (*Phenomenology of Spirit*, 1807; *Science of Logic*, 1812-16), *objective / absolute idealism*. Reality is the dialectical self-unfolding of Absolute Spirit (*Geist*). History is the realization of reason. - **Jonathan Edwards** (*Notes on the Mind*, c. 1720s; "Of Atoms", c. 1722), *theological idealism*. Physical reality exists as God's continuous communication / thought. Bodies are divine acts of will sustaining ordered sense-experience. - **F. H. Bradley**, **J. M. E. McTaggart**, **Josiah Royce** (late 19th / early 20th c.), *British and American absolute idealism*. Reality as a single mental whole. - **Gordon Clark** (mid-20th c.), Reformed *Scripturalist* idealism: knowledge and reality reside in God; physical particulars are derivative. - **Bernardo Kastrup** (*The Idea of the World*, 2019; *Why Materialism is Baloney*, 2014), contemporary analytic idealism, framed against materialism. ## Variants ### Subjective idealism (Berkeley) To be is to be perceived. Material substance is a meaningless abstraction; what we call "physical objects" are coherent patterns of sense-experience. God is the universal perceiver whose continuous perception sustains the world's existence even when no human is observing it. ### Transcendental idealism (Kant) We cannot know things-in-themselves. The structure of experience (space, time, causality) is contributed by the perceiving mind, not read off the noumenal world. This is a more *epistemic* than *metaphysical* idealism. ### Objective / absolute idealism (Hegel, Bradley) Reality is mental, but not in any individual's mind. The cosmos is the unfolding of Absolute Spirit / Mind / Reason. History, nature, and morality are moments in this unfolding. ### Theological idealism (Edwards, Clark, some Reformed) Physical reality is sustained by God's continuous thought / will. The world is real, but its reality is *constituted* by divine mental act, not by independent matter. Distinct from pantheism: God is not identical to creation; creation is a sustained divine thought / communication. ### Panpsychism / cosmopsychism A neighboring family: consciousness is fundamental and ubiquitous (panpsychism) or there is one cosmic consciousness in which everything participates (cosmopsychism). Galen Strawson, Philip Goff, Bernardo Kastrup are contemporary defenders. ## Christian engagement ris3n's note scores theological idealism at 42/100 biblical alignment versus realism at 90/100, with the principal problems being: - **[Genesis 1:1](/codex/genesis-1-1/)** describes God creating an external "heavens and the earth", language of *making*, not of *thinking-into-being*. - **[John 1:3](/codex/john-1-3/)**, "all things came into being through Him", names a real ontological coming-into-being, not a mental projection. - **[Romans 8:19-22](/codex/romans-8-19-22/)**, creation groans for redemption, suggesting a real subject distinct from God. - The **Incarnation** requires real flesh; if matter is illusion, the body of Christ becomes problematic (Docetic tendency). - **Evil** becomes either part of God's mental content or unreal, both tear at biblical theism. The cross-examination in develops these points in courtroom format, arguing that objective idealism either collapses into pantheism, makes God the author of evil, or empties the gospel of its physical reality. That said, *aspects* of idealism are theologically useful: - God's *sustaining* of creation ([Colossians 1:17](/codex/colossians-1-17/), [Hebrews 1:3](/codex/hebrews-1-3/)), "in him all things hold together". - The Logos doctrine ([John 1:1](/codex/john-1-1/)), creation through the divine Word / Reason. - The intelligibility of nature reflecting God's rationality. These are realist-with-idealist-flavor: God's ongoing thought sustains reality, but reality is genuinely external to him. ## Strengths and weaknesses **Strengths:** - Honors the apparent priority of mind, consciousness, and intelligibility. - Avoids the [hard problem of consciousness](/codex/naturalism/) by starting from mind. - Coherent with the Christian sense that reality is *meaning- saturated* and divinely upheld. - Subjective idealism actually motivates Berkeley's critique of scientific materialism, physical-object talk needs a perceiver to be coherent. **Weaknesses:** - Subjective idealism collapses into solipsism if God's role as cosmic perceiver is rejected. - Objective / absolute idealism collapses into pantheism (see [Pantheism](/codex/pantheism/)), Hegel especially. - Cannot make natural sense of the gritty externality of experience: stubbed toes, persistence of unobserved objects, the testimony of physical science. - Theological idealism risks confusing God's *knowledge* of things with their *being*, eroding the Creator/creature distinction (see [Ipsum Esse Subsistens](/codex/ipsum-esse-subsistens/)). - The doctrines of incarnation, resurrection, and bodily redemption sit awkwardly in any view that denies real materiality. ## See also - [Materialism](/codex/naturalism/), the historical foil. - [Naturalism](/codex/naturalism/), overlapping but distinct (idealism rejects matter; naturalism rejects the supernatural). - [Pantheism](/codex/pantheism/), what objective idealism often collapses into. - [Modal Argument from Mind](/codex/modal-argument-from-mind/), anti-physicalist argument that shares some idealist intuitions. - [Argument from Consciousness](/codex/argument-from-consciousness/), the hard-problem argument. - [Self-refutation](/codex/self-refutation/), Berkeley's "esse est percipi" famously faces self-refutation worries. - Plato, [Rene Descartes](/codex/rene-descartes/), proto-idealist influences. - [Cornelius Van Til](/codex/cornelius-van-til/), Reformed engagement with idealist tendencies.
## Common questions this page answers **Q: What is idealism in philosophy?** Idealism is the position that the basic stuff of reality is mental, not material. The world is made of minds and ideas; matter is either a kind of dream, a presentation in a cosmic mind, or an appearance rather than an underlying reality. It opposes [Materialism](/codex/naturalism/) (everything is matter) and is distinct from [Naturalism](/codex/naturalism/) (some idealists are theists, others not). **Q: What is Berkeley's idealism?** George Berkeley (1685-1753) argued that "to be is to be perceived" (*esse est percipi*). The tree in the quad is real because God is always perceiving it; matter as substance that exists independent of any mind, Berkeley held to be incoherent and unnecessary. Samuel Johnson famously kicked a stone and said "I refute him thus"; Berkeley would have answered that the kick is itself a mental event in a mental quad. See [Empiricism](/codex/empiricism/) for the broader context. **Q: Is Christianity committed to materialism or idealism?** Neither, strictly. Mainstream Christian metaphysics (Augustine, Aquinas, the Reformed tradition) is *realist*: the world is real, distinct, external, created by God but genuinely other than him. A minority theological-idealist strand (Jonathan Edwards, Gordon Clark, more recently James Spiegel) holds the world is continuously thought into being by God, so it is mental in his mind but objective for us. Both Christian options reject metaphysical materialism. **Q: Why has idealism revived recently?** The Hard Problem of [Consciousness](/codex/consciousness/) has revived interest in idealism. If consciousness cannot be reduced to or explained by matter, some philosophers (Bernardo Kastrup, Galen Strawson in the panpsychist direction) argue mind must be more fundamental than matter. This gives Christianity a friendlier metaphysical neighbor than strict materialism, even when mainstream Christian thought does not go fully idealist. **Q: What is the difference between subjective and objective idealism?** *Subjective idealism* (Berkeley) holds reality consists in particular minds and their ideas. *Objective idealism* (Hegel, modern Absolute Idealism) holds reality is the unfolding of one cosmic Mind. *Transcendental idealism* (Kant) holds we know only phenomena structured by the mind's categories, not things in themselves. *Theological idealism* (Edwards, Berkeley in his theist deployment) grounds the cosmic Mind in God.