Three unconnected intellectual traditions, separated by two thousand years and several continents, converge on the same claim: that the self you experience as your body and biography is not the whole of what you are.
What follows treats that convergence honestly, tradition by tradition, rather than blurring them into a single vague feeling.
Atman and Brahman
The oldest and most fully developed version of this claim comes from the Upanishads, the philosophical texts composed in ancient India beginning around the 8th century BCE, and later systematized by the philosopher Adi Shankara in the 8th century CE into the school known as Advaita Vedanta. The central claim is specific: Atman, the innermost self, is not merely similar to Brahman, the ultimate ground of reality, it is identical to it. The famous formulation from the Chandogya Upanishad, tat tvam asi, “that thou art,” states this directly rather than metaphorically. What ordinary experience presents as a separate, bounded individual is, in this framework, Brahman appearing to itself as many, through a limiting principle the tradition calls maya, usually translated as illusion but more precisely meaning the power that makes the one appear as many.
This is a precise metaphysical claim with genuine internal debate attached to it, not a vague spiritual gesture. Other schools of Vedanta, notably Ramanuja’s Vishishtadvaita and Madhva’s Dvaita, explicitly rejected Shankara’s strict non-dualism, arguing for a permanent distinction between the individual soul and the divine. The tradition itself does not present a single, unanimous answer here. What it does present consistently is the claim that ordinary self-identification with body, occupation, nationality, and belief is a provisional, not ultimate, description of what a person is.
The Gnostic Reading
A structurally similar but historically unrelated claim appears in Gnostic Christian and Jewish sects of the first through third centuries CE. In texts like the Apocryphon of John, recovered among the Nag Hammadi library in 1945, the material world is not the direct creation of the true, transcendent God but of a lesser, flawed creator figure called the Demiurge, often identified with the Hebrew Bible’s Yahweh reinterpreted as an ignorant or arrogant intermediate power. Trapped within matter is a spark of the true divine light, present in some or all humans depending on the specific Gnostic school, and salvation consists of gnosis, direct experiential knowledge of this spark’s true origin, rather than faith or ritual observance.
What connects this to the Vedantic claim above, and what doesn’t, deserves precision. Both propose that ordinary embodied identity conceals a deeper, non-material self connected to ultimate reality. They differ sharply on the character of the material world itself: Advaita Vedanta treats maya as an appearance without independent malicious intent, while Gnostic cosmology treats the material world as the product of a specifically flawed or hostile lesser power. These are not the same claim wearing different cultural clothing. They’re two different answers to a related question, and treating them as interchangeable erases what’s actually interesting about each.
Leibniz’s Monads
A third, much later and entirely independent tradition comes from Gottfried Wilhelm Leibniz’s 1714 text The Monadology. Leibniz proposed that reality is ultimately composed of monads, simple, indivisible, non-physical substances that have no windows, meaning they don’t causally interact with each other directly, yet each one reflects the entire universe from its own unique perspective through a pre-established harmony that Leibniz attributed to God’s design. What appears as physical matter, in Leibniz’s system, is the well-founded phenomenon arising from aggregates of monads, not the fundamental level of reality itself.
This is a historically significant contribution to Western metaphysics in its own right, and it deserves to be represented on its actual terms rather than loosely paraphrased. Leibniz was responding directly to problems in Cartesian dualism and in the emerging mechanical philosophy of his contemporaries. His monads are not souls in transient amnesia awaiting awakening, a later, different framing. They are metaphysical simples proposed to solve specific technical problems about substance, causation, and the unity of perception that occupied philosophers of his era.
The Simulation Argument
The modern iteration of this family of ideas is philosopher Nick Bostrom’s 2003 paper “Are You Living in a Computer Simulation?,” published in Philosophical Quarterly. Bostrom’s actual argument is narrower and more careful than its popular retelling usually allows. He argues that at least one of three propositions is very likely true: that civilizations almost always go extinct before reaching the technological capacity to run high-fidelity simulations of conscious beings, that civilizations which reach that capacity choose overwhelmingly not to run such simulations, or that we are, in fact, almost certainly living in a simulation, since a civilization capable of running many such simulations would produce vastly more simulated minds than original ones.
This deserves stating precisely because it’s commonly misrepresented. Bostrom’s argument does not claim that quantum mechanics, DNA’s structure, or déjà vu constitute evidence for the simulation hypothesis. Nothing in his paper treats particle behavior or genetic coding as clues pointing toward a simulated universe. The argument is a probabilistic trilemma about civilizational trajectories, not a claim resting on physical anomalies, and presenting it as though it were supported by “quantum quirks” misrepresents what Bostrom actually wrote.
What the Convergence Actually Shows
Four traditions, an ancient Indian philosophical school, a set of early Christian and Jewish sects, a German Enlightenment rationalist, and a 21st-century Oxford philosopher, each independently proposed that embodied, individual identity is not the deepest available description of what a person is. That’s a striking pattern in the history of ideas, and it doesn’t require flattening the genuine differences between these frameworks to be interesting. Advaita Vedanta’s non-dual Brahman, Gnostic cosmology’s trapped divine spark, Leibniz’s windowless monads, and Bostrom’s simulated minds are four distinct proposals, developed for different reasons, answering different questions, using entirely different methods of argument.
What they share is a philosophical instinct that holds up on its own terms: that the sense of being a fixed, separate, purely physical individual might be a limited vantage point on something larger, whatever that something turns out to be. Each tradition offers its own account of what to do with that instinct, contemplative practice in the Vedantic case, gnosis in the Gnostic case, rational metaphysics in Leibniz’s case, and probabilistic reasoning about technological civilizations in Bostrom’s. None of them require accepting the others to stand on their own.
