Philosophical Idealism

My students will be discussing philosophical idealism this week so I thought it'd be appropriate to rerun this post from earlier in the year: Bruce Gordon is one of the most brilliant and accomplished thinkers alive today. Among other things he's a historian and philosopher of science and was interviewed recently by another scientist, neurosurgeon Michael Egnor, on a number of topics, including philosophical idealism.

Gordon is one of a growing number of philosophers who find idealism a compelling hypothesis. The interview begins with Dr. Gordon explaining George Berkeley's (1685-1753) version of idealism:

Michael Egnor: What is idealism?

Bruce Gordon: There are a lot of different varieties of idealism, and rather than go through a laundry list of its variations, let me just start with the kind of idealism that I would be an advocate of, which is an ontic theistic idealism, essentially a form of idealism that is probably most closely identified with the Anglican Bishop, George Berkeley.

George Berkeley 1727

Basically, it’s the idea that material substances, as substantial entities, do not exist and are not the cause of our perceptions. They do not mediate our experience of the world.

Rather, what constitutes what we would call the physical realm are ideas that exist solely in the mind of God, who, as an unlimited and uncreated immaterial being, is the ultimate cause of the sensations and ideas that we, as finite spiritual beings, experience intersubjectively and subjectively as the material universe....So we are, in effect, living our lives in the mind of God.

And he is a mediator of our experience and of our inner subjectivity, rather than some sort of neutral material realm that serves as a third thing between us and the mind of God, so to speak.

The discussion then turns for a bit to Plato's notion of idealism as expressed in his theory of Forms.

Plato believed that every particular thing that exists has an ideal essence or form that exists in some abstract realm of reality. Every chair, for example, is recognizable as a chair because it "participates" in the perfect abstract form of "chairness," every tree is recognizable as a tree because it "participates" in the perfect form of "treeness."

Likewise with everything, including humans.

Later Christian Platonists argued that these essences, or forms, or ideals existed not in some abstract realm but rather as ideas in the mind of God, and this, it seems, is Gordon's view as well.

Michael Egnor: There are, I believe, other kinds of idealism. For example, idealism by German philosophers. And how does that differ from Berkeleyan idealism?

Bruce Gordon: Well, .... [Immanuel] Kant (1724-1804) advocated a kind of epistemic, as opposed to ontic, idealism. Kantian idealism is entirely compatible with the existence of material substances, even though they are inaccessible as things in themselves.

So for Kantian idealism, you’ve got a self that .... precedes and grounds all of our experience. And our perception of reality, then, is governed by the innate structure of the human mind.

Immanuel Kant 1768 

What Gordon is saying here is that Kant believed that a material world existed but that everything we know about it is based on our sensory perceptions which produce ideas or sensations in the mind. Our mind is so structured as to create these ideas, but the ideas may be nothing at all like the thing they represent.

In other words, what we know about the "thing in itself" is the sum of the ideas (or sensations) we have of it in our minds. We can't know it as it exists independently of our perceptions of it.

For example, our minds, upon seeing, smelling and tasting chocolate, generate the ideas of a certain color, fragrance and flavor, but these ideas are in our minds, they're not in the chocolate. The chocolate itself doesn't have color, it simply reflects certain wavelengths of light. Likewise, it doesn't have fragrance or flavor. It simply exudes chemicals which interact with our senses to produce the ideas of fragrance and flavor in our minds.

As Kant put it, “You only know me as you see me, not as I actually am."

Bruce Gordon: So we never experience reality in itself, which he called the noumenal world, but only reality as it appears to us, a ... phenomenal reality that is ordered by the innate structures of the human mind.

Kantian idealism and its descendants are, in many ways, an epistemic form of idealism, whereas the Berkeleyan form of idealism is ontic.

By this Gordon means that Kant's idealism had to do with what we can know about the world whereas Berkeley's idealism had to do with the ontology of the world - what was actually real and what reality was like. Gordon adds:

[Berkeley's Idealism is] a denial that there is material substance and [is instead] an embedding of reality in the mind of God, such that it is finite spiritual beings experiencing the reality brought into existence by this unlimited, uncreated, immaterial being.

Berkeley's idealism, then, was different from Kant's. Berkeley held that there was no material world at all. Everything we experience we experience as ideas in our minds, ideas which are presented to our minds by the mind of God.

As Berkeley himself says, “All the choir of heaven and furniture of earth — in a word, all those bodies which compose the frame of the world — have not any subsistence without a mind.” This may seem bizarre at first reading, but according to the Stanford Encyclopedia of Philosophy “Berkeley’s system, while it strikes many as counter-intuitive, is strong and flexible enough to counter most objections.”

It's interesting that in the last fifty years or so many physicists have embraced idealism. They're persuaded by developments in quantum mechanics that reveal that at the subatomic level many properties of the entities scientists study at that level don't exist until they're observed.

For instance, the 20th century scientist Max Planck, often called the father of quantum mechanics, once stated that,

As a man who has devoted his whole life to the most clear headed science, to the study of matter, I can tell you as a result of my research about atoms this much: There is no matter as such. All matter originates and exists only by virtue of a force which brings the particle of an atom to vibration and holds this most minute solar system of the atom together.

We must assume behind this force the existence of a conscious and intelligent mind. This mind is the matrix of all matter.

And Sir James Jeans, in his book The Mysterious Universe, wrote that, "The universe is beginning to look more and more like a great thought rather than a great machine."

Idealism has considerable intellectual appeal for quantum physicists, but I should think it would also be attractive to some thoughtful theologically oriented folks since the doctrine conforms nicely to the conviction that the reality we experience is fundamentally a projection of the mind of God.