Nagarjuna, writing in India sometime in the second century, was engaged in a project that looks, from a distance, like the opposite. Where Descartes was searching for a foundation that could not be doubted, Nagarjuna was systematically demonstrating that no such foundation exists. Where Descartes hoped to arrive at certainty, Nagarjuna's method was to show that every claim to certainty, when examined carefully, dissolves. And yet the two are in conversation with the same question. What can we actually know? And what happens to us when we look honestly at the limits of knowing?
I. Descartes and the Architecture of Doubt
The Meditations on First Philosophy is one of the strangest philosophical documents in the Western tradition. It is written in the first person, as a kind of diary of a mind systematically taking itself apart. Descartes does not argue from outside. He inhabits the doubt. He becomes the skeptic in order to overcome skepticism, or so he intends.
His method is often called hyperbolic doubt. He asks: what would have to be true for everything I believe to be false? He imagines a malicious demon of unlimited power who has dedicated itself to deceiving him about everything, including the evidence of mathematics. Could two plus two equal five if a sufficiently powerful deceiver wanted it to? Under that premise, almost nothing survives.
But one thing does. Even if the demon is deceiving him about everything else, the act of being deceived requires a mind that is being deceived. Cogito ergo sum. I think, therefore I am. The thinking self is the one thing the doubting cannot dissolve, because doubting is itself a form of thinking.
From this foundation, Descartes rebuilds carefully. He argues that a perfect God would not deceive, and that the clear and distinct ideas of reason therefore correspond to something real. The external world is recovered. The body is recovered. Mathematics is trusted again. The whole architecture of certainty is reconstructed, but now on a foundation that has survived the most severe test he could devise.
What Descartes wanted from this exercise was stability. The anxiety driving the Meditations is not abstract. He was writing at a moment when the old authorities, theological, scholastic, Aristotelian, were being challenged from every direction. He wanted to find something that could not be taken away. A floor beneath the uncertainty.
Whether he succeeded is a question philosophers have been arguing about ever since. The cogito is remarkably resilient. But the reconstruction that follows it, the jump from thinking self to benevolent God to reliable external world, has convinced fewer readers than Descartes hoped. The foundation held. The building on top of it has remained contested.
II. Nagarjuna and the Method of Dissolution
Nagarjuna's Mulamadhyamakakarika, usually translated as the Fundamental Verses on the Middle Way, is a text organized around a single practice: taking a philosophical concept and demonstrating that it cannot be coherently defined. Not that the concept is false, exactly, but that any attempt to establish it as a fixed, self-existing thing produces contradiction.
He applies this to causation. To motion. To time. To the self. To existence and non-existence. In each case, the structure is similar. He examines what a concept would have to mean if it referred to something real and stable, and then he shows that the definition required collapses under examination. Things cannot cause themselves. They cannot be caused by something entirely other than themselves. So what is causation?
His answer is not that causation is an illusion in the simple sense. It is that causation is empty of inherent existence. It arises in dependence on other things, it is part of a web of mutual conditioning that has no fixed points, and when you try to locate the thing itself apart from those relations, there is nothing there to locate.
This is the doctrine of sunyata, often translated as emptiness or voidness. It is one of the most misunderstood concepts in Buddhist philosophy, frequently taken to mean that nothing is real, that everything is illusion. Nagarjuna is careful to resist this reading. He is not saying the world does not exist. He is saying it does not exist in the way we habitually assume it does, as a collection of fixed, independent, self-sufficient things. Instead, everything exists relationally. Things are constituted by their relationships rather than standing apart from them.
The self, for Nagarjuna, is subject to the same analysis. There is no unchanging, independent entity underneath the thoughts, perceptions, and memories. There is a process, a pattern of arising, a set of relationships. The self is real the way a river is real: not as a fixed thing but as a movement that is never the same twice and cannot be located in any single moment.
III. Where They Meet, and Where They Part
At first glance, Descartes and Nagarjuna look like opposites. One seeks an unshakeable foundation. The other systematically removes every foundation on offer. One wants certainty. The other demonstrates that certainty, in the form both traditions have usually wanted, is not available.
But look more carefully and something interesting appears. Both thinkers begin with the same gesture: radical doubt. Both take the question of reliable knowledge seriously enough to apply maximum pressure to it. Both are suspicious of the inherited answers. And both arrive, through very different routes, at a reckoning with the limits of the self as a knowing instrument.
Descartes finds the thinking self and treats it as a foundation. Nagarjuna examines the thinking self and finds that it, too, is empty of inherent existence. The self that doubts does not stand apart from the world it doubts. It arises within the same web of conditioning. The cogito, in Nagarjuna's framework, would not be a foundation but another dependent arising, real as a river is real, but not fixed, not self-standing, not the bedrock Descartes needed it to be.
This is not a refutation of Descartes exactly. It is a different answer to the same anxiety. Descartes wanted a floor because the alternative seemed like falling. Nagarjuna would say: what if the falling is the point? What if the recognition that there is no fixed floor is itself the liberation being sought, not a disaster to be avoided?
IV. What the Conversation Opens
Placing these two thinkers in dialogue is not an exercise in showing that Eastern thought anticipated Western thought, or that Western rationalism was asking questions Buddhism already answered. The traditions are genuinely different, and the differences matter. What the conversation opens is a question that neither tradition exhausts: what do we do with the discovery that knowledge has limits?
The options on offer are roughly these. You can, with Descartes, search for the place where certainty holds and build from there. You can, with Nagarjuna, practice becoming comfortable in the uncertainty itself, learning to move through a world where nothing is fixed without that movement becoming paralysis. Or you can, as most of us do most of the time, avoid the question until something forces it.
What both thinkers agree on, across the enormous distance between them, is that avoidance is a choice with consequences. The person who has never seriously asked what they can actually know, and why, is operating on assumptions they have never tested. Some of those assumptions will be fine. Some will be the architecture of errors that compound over years.
The examined life, in this sense, requires epistemological honesty. Not just ethical honesty: what should I do? But the quieter, harder honesty: how do I know what I think I know? And what am I doing when I believe things?
Closing Reflection
Descartes ended his meditation in certainty, or believed he did. Whether the certainty was earned is still being argued. Nagarjuna ended his in a carefully cultivated openness that he insisted was not nihilism but something closer to freedom.
The question they share is not a comfortable one. It asks you to look at the thing you use to look at everything else: the knowing mind itself. To ask whether the instrument you trust for all your judgments is as reliable as you have assumed. To sit with the possibility that it is not, and to figure out what kind of life remains available to you in that light.
It is a question worth approaching slowly, and more than once.