Naturalistic spirituality

Naturalistic spirituality describes spiritual experience without making supernatural belief its necessary source or conclusion. The book develops the idea through psychedelic journeys that seem to loosen the ego’s hold on awareness, making ordinary boundaries between self and world feel less absolute. Such experiences can disclose connection, presence, and meaning while leaving the person’s account of reality naturalistic. The term does not settle what a vision ultimately means; it names the possibility that spiritual significance can arise within embodied human experience and relationships with the living world.

Experience Without Supernatural Belief

The author’s own psilocybin journey brought a striking tension into focus: something novel and profound had happened, and he was willing to call it spiritual, but not because it had convinced him of God or a supernatural consciousness. His score on the Mystical Experience Questionnaire confirmed that the experience met researchers’ criteria for a mystical experience, yet that classification did not dictate a metaphysical interpretation. The distinction matters: the experience could be powerful and sacred in its felt character without serving as evidence, for him, of a supernatural world.

The author connects this possibility to Dinah Bazer, a cancer patient who entered and left her psilocybin session an avowed atheist. During the session, she experienced herself as immersed in divine love, and the journey extinguished her fear of death; afterward, her atheism remained intact. The author reads her language as an attempt to express an overwhelming gift of love that seemed to have no individual or worldly cause. In this account, religious language can name the scale and gratuitousness of an experience without proving that its source is supernatural. The same experience may thus be spiritually consequential and compatible with disbelief.

For the author, the word spiritual becomes useful when the ego’s voice is muted. He describes the ego as a familiar but ultimately strange psychic construction that stands between ordinary awareness and dimensions of experience that might otherwise remain inaccessible. Its temporary quieting did not make him regard its dissolution as a supernatural event; rather, the journeys helped him understand why traditions that value transcendence of the ego might treat that change as a condition for spiritual development. The result is not a final doctrine but an interpretation that remains open and provisional.

The Ego, the Living World, and Connection

The concept also concerns how ordinary consciousness organizes what it admits. Drawing on Aldous Huxley’s account of the mind’s reducing valve, the author presents the ego as a vigilant filter: it narrows awareness toward information useful for survival and action, while screening out distractions, memories, and strong emotions. In his interpretation, this selectivity also encourages people to treat the world as an arrangement of objects, reserving subjectivity for themselves. When psilocybin quieted that habitual stance, he felt able to apprehend the plants in his garden as having a spirit—not as a conclusion established by scientific measurement, but as a changed experience of other forms of life.

The author links that experience to ecology and coevolution, which describe species acting upon and affecting one another. When such interdependence becomes a felt relationship rather than an abstract proposition, he is willing to call it spiritual. The same pattern appears in experiences of merging with music and of embracing his son and grandfather. These episodes place spiritual significance not only in extraordinary visions but also in felt relation: the self becomes less isolated from other people, living things, and the surrounding world.

In this account, the loosening of the ego can open awareness to both wonders and terrors ordinarily kept at a distance. Unexpected patterns and connections become available, and the perceived gulf between self and world narrows. Whether the wider reality is named Nature, Mind at Large, or God is less important to the author than the experience of belonging to something larger. He suggests that this sense of connection may make death less frightening by weakening the self’s insistence on separateness. A psychedelic journey can therefore matter as a source of meaning without requiring the participant to settle the ultimate nature of what was experienced.

Indigenous Practice and the Limits of Interpretation

The book’s account of Mazatec mushroom practice makes clear why experience must be distinguished from an outsider’s explanation of it. The sacramental use of psychoactive mushrooms had been kept from Westerners for centuries after Spanish conquest drove it underground. Colonial authorities sought to suppress the practice, destroyed mushroom stones, and treated the use of plants for divination as a threat to church authority. The conflict also involved competing accounts of access to the divine: the mushroom could offer an immediate experience, whereas Christian communion was mediated by church ritual and priesthood.

That history does not mean that every later mushroom ceremony had the same purpose. When R. Gordon Wasson attended a ceremony with María Sabina in 1955, he arrived with a theory that psychoactive fungi lay at the roots of religious experience. He told Sabina that he was concerned about his son and wanted to learn of his whereabouts and well-being, gaining access through a healing and divinatory purpose. By that period, many Mazatecs were Catholics, and mushrooms were used to heal the sick and to locate missing people or important objects. Wasson knew of these contemporary uses, but his presentation emphasized a universal search for God and treated the ceremony as a form of holy communion. His interpretation thus risked converting a specific, living practice into confirmation of a theory he had brought with him.

This distinction is central to a careful naturalistic account. A powerful experience may acquire spiritual meaning for the person who undergoes it, but that meaning should not erase the purposes practitioners themselves give to their ceremonies. Nor should a visitor’s experience be treated as a transparent window onto the history or theology of an Indigenous tradition. The book places the intensity of visionary experience alongside the cultural contexts that shape its use and interpretation.

Practices, Guidance, and the Work of Meaning

The book presents contemporary psychedelic practice as dependent not only on a substance but also on preparation, guidance, and the framework in which an experience can be understood. A draft charter for psychedelic guides describes its aim as making profound experiences more available, including states described as unitive or nondual. It includes meditation, breathwork, and fasting among possible routes, while identifying psychoactive substances as potent spiritual catalysts. In that formulation, spiritual experience is not confined to drug use, though psychedelics can be one means of reaching it.

The guide community’s ethical documents acknowledge that participants may be unusually open to suggestion and exploitation. They call for disclosure of risks, informed consent, confidentiality, attention to clients’ safety and health, restraint from self-promotion, and accommodation regardless of ability to pay. The guidelines also address preparation, intentions, possible drug interactions, frightening material, and post-session integration. These practices provide a social container for experiences that may be difficult to interpret; they also recognize that the guide’s language and expectations can influence how a participant makes meaning.

Patrick Mettes’s planned treatment illustrates the structure of such a setting. After preparatory therapy, he was to receive two sessions: an active placebo consisting of a high dose of niacin and a session with twenty-five milligrams of psilocybin. He would lie on a couch wearing eyeshades and listening to selected music, with Tony Bossis and a second sitter present. Bossis advised him to trust the process and to move toward threatening material rather than flee it. This framework does not establish a supernatural explanation for what might occur; it organizes the session and offers a way to approach its contents.

A different, more explicitly ceremonial frame accompanied the author’s ayahuasca journey in a yoga studio, among a dozen strangers and under the guidance of a woman trained by Leo Zeff. Participants heard traditional icaros, prayers, and invocations to ayahuasca as grandmother or plant teacher; bells, rattles, shakapas, scents, and smoke helped establish the ceremony’s atmosphere. The setting joined Indigenous-derived ritual forms to a modern gathering far from the Amazon. Across such distinct settings, naturalistic spirituality holds together intense personal experience, human guidance, cultural inheritance, and the continuing need to interpret what a journey means.