In the broadest terms, the philosophical theory of physicalism maintains that the explanation for how minds came about is no different from the explanation for how rivers, trees, mountains and meadows came about. Mind was not something extra, added at the beginning or somewhere along the way; rather, from the stock of basic physical ingredients that make up a human—mostly oxygen, hydrogen, nitrogen, carbon, calcium and phosphorus—all that was required was the cooking.

Barbara Gail Montero, Philosophy of Mind: A Very Short Introduction

It is sometimes feared that abandoning dualism – “which maintains that the immaterial mind, or soul, is an additional ingredient, brought into the world by God at the moment of conception” (Montero, ibid.) – will leave us bereft of the spiritual dimension of life, which for many of us is the sweet core of our own being. But as Sam Harris says, in a passage I seem to be unable to avoid quoting on a regular basis,

Spirituality begins with a reverence for the ordinary that can lead us to insights and experiences that are anything but ordinary. And the conventional opposition between humility and hubris has no place here. Yes, the cosmos is vast and appears indifferent to our mortal schemes, but every present moment of consciousness is profound. In subjective terms, each of us is identical to the very principle that brings value to the universe. Experiencing this directly—not merely thinking about it—is the true beginning of spiritual life.

An analogy that sometimes occurs to me is one drawn from technology. Of course this blog could not exist without the internet, without the web host’s data centres and the fibre optics that connect them, without this tablet I’m writing on, and its connection to the internet, without the hardware whose screen you are reading now. But however carefully you study any of that hardware, you will not come across these ideas. They are data; and the content management system that brings them to you is software. These are not, in the crude sense, material things; but they are entirely dependent on all that copper and silicon and glass, not to mention the rare metals, so intricately and painstakingly manufactured to contain and to convey them.

Minds are not the brain’s neurons and their blood supply, nor the neurotransmitters that ripple across their synapses; and while you could get a pretty good idea from the brain’s activity that there was something going on, you will never find a mind in there, in the sense of a physical structure, no matter how long you scan and probe and watch. Mind, and the mind’s subjectivity, is not, in the crude sense, a material thing; but it is entirely dependent on all those intricate and beautifully balanced cells and fluids and exchanging gases, not to mention the heart and lungs and blood and liver and all the rest of the kit that allows the physical brain to keep running.

None of this should give us cause to grieve. Just as understanding, however sketchily, the intricacies of the internet cannot take anything away from the ideas and dreams it conveys, nor can the work of the neuroscientist or the philosopher of mind detract from the beauty of contemplative spirituality, or the love between those who practice and teach it. The stillness is what it always has been; the open awareness that is grounded there is just as luminous. All we need is to be still enough to let it be.