One Without a Second: How a Rigvedic Riddle Grew Into Advaita Vedanta

A hymn that doubts its own god

Sometime past three thousand years ago, a poet in the Punjab composed a hymn about the origin of everything and ended it by admitting that the one being who might know how it all started probably does not know either. Read that again. This is not a heretic scribbling in a margin. It is RV 10.129, the Nāsadīya Sūkta, sitting inside the oldest layer of Sanskrit scripture, chanted and preserved with obsessive care for a hundred generations. Its last verse looks up at the highest heaven, at the overseer of creation, and says: maybe he knows, or maybe he does not.

Most sacred literature answers the question of origins. This hymn refuses to. It walks the reader up to the edge of a cliff, points into the fog, and declines to invent a floor. What existed before existence? “The nonexistent did not exist, nor did the existent exist at that time,” runs the opening in the standard modern translation.[1] No sky, no death, no day. Only, in verse 2, “the One” breathing without wind, by its own power, with nothing beside it.

Here is the thing worth noticing before any theology arrives. The poet does not name a god and stop. He names a “One,” tad ekam, that precedes the gods, precedes even the distinction between something and nothing. The familiar deities of the Rigveda, Indra with his thunderbolt, Agni in the fire, Uṣas reddening the dawn, are, the hymn says flatly in verse 6, “later than creation.” They are effects, not the cause. Something is prior to all of them. And that something is one.

This article follows a single thread from that hymn forward: the idea that behind the world’s plurality lies one reality without a second, and that a human being can know it directly. The thread runs from a handful of Rigvedic verses, through the Upaniṣads, to the philosopher Śaṅkara and the school called Advaita Vedānta, “the Vedānta of non-duality.” The interesting question is not whether the Rigveda “contains” Advaita. It is subtler and more human than that: how much did the poets glimpse, and how much did their heirs read back into them?

Truth is one; the poets keep multiplying it

If the Nāsadīya is the mood, then the doctrine, compressed to almost nothing, is a single half-line buried in a long riddle hymn ascribed to the seer Dīrghatamas. RV 1.164.46 lists the great gods and then dissolves them:

ékaṃ sád víprā bahudhā vadanti / agníṃ yamáṃ mātaríśvānam āhuḥ

“They say it is Indra, Mitra, Varuṇa, Agni, and also it is the winged, well-feathered (bird) of heaven. Though it is One, inspired poets speak of it in many ways: they say it is Agni, Yama, Mātariśvan.”

Rigveda 1.164.46. After Jamison and Brereton (Oxford, 2014), with diacritics standardised.[2]

Six words carry the whole future of Indian philosophy: ekaṃ sad viprā bahudhā vadanti, “The Real is one; the poets speak it in many ways.” The gods are not being denied. They are being demoted to names, vocabulary, ways of pointing at a single referent. This is the move Advaita would later make its foundation: the many are real as appearances, one as being.

You could read this as a marketing pitch, and in a sense the poets were making one. They were selling a difficult idea to a culture that loved its gods: that all the gods you already worship are the same thing, seen from different angles. Notice how gentle the rhetoric is. It does not smash the idols. It tells you the idols were always pointing home.

Now the caution, because the scholarship here is a genuine fight and pretending otherwise would be dishonest. What kind of “oneness” is this? Three readings compete.

Max Müller, reading the Rigveda in the 1860s, was struck that the poets kept calling whichever god they addressed the greatest, the first, the maker of all. He refused to flatten this into either polytheism or monotheism and coined a word for it: henotheism, later refined to kathenotheism, “one-god-at-a-time-ism.”[3] On this view the Rigveda is not yet philosophy. It is exuberant devotion that happens to keep bumping into unity.

Paul Deussen, Schopenhauer’s disciple and Nietzsche’s friend, pushed the other way. For Deussen the whole Vedic corpus was a slow climb toward the Upaniṣadic identity of self and absolute, and the monist verses were early rungs on that ladder.[4] He wanted the Rigveda to be reaching for Advaita, and he read it accordingly.

The modern philological consensus, best represented by Stephanie Jamison and Joel Brereton’s complete 2014 translation, is more careful. Verses like 1.164.46, they note, are ritual and poetic identifications, the poet’s craft of collapsing one god into another, not a worked-out metaphysics of the One.[1] The oneness is real in the text. Calling it “monism” is a later label the text did not choose for itself.

Aside. The difference matters for how you read every “the gods are one” line in world scripture. A ritual identification says “for the purpose of this offering, Agni is Varuṇa.” A metaphysical monism says “Agni and Varuṇa are, in ultimate fact, one being.” The Rigveda often does the first. Advaita insists the second was there all along. Watching that gap is the whole game.

The One that has a body, and the One that speaks

The Rigveda gestures at unity from more than one direction, and the directions do not fully agree. That disagreement is itself a clue that we are watching thought being born, not copied.

One route is cosmic and impersonal, the tad ekam of the Nāsadīya. Another is strikingly embodied. In the Puruṣa Sūkta, RV 10.90, the universe is a single giant Person who is sacrificed, and from whose body the worlds, the social orders, and the gods are cut. Everything that exists is literally one being’s flesh. This is monism with a spine and lungs: the world is not made by a god, it is a god, dismembered into multiplicity. (I have written separately on that hymn’s uncomfortable politics; here it matters only as evidence that a Rigvedic poet could think “all this is one Person.”)

A third route is the boldest, and it is spoken in the first person by a goddess. In the Devī Sūkta, RV 10.125, the goddess Vāc, Speech herself, declares:

“I move with the Rudras, with the Vasus, with the Ādityas and All-Gods. I carry both Mitra and Varuṇa, both Indra and Agni, both Aśvins. … It is I who say, of myself, what pleases gods and men.”

(RV 10.125.1, 5, after Jamison and Brereton)[1]

A single “I” claims to contain all the gods and to be the source of thought and speech in every being. Read that beside the Upaniṣadic ahaṃ brahmāsmi, “I am the absolute,” and you feel the current running. The grammar of Advaita, a first-person voice identifying itself with the totality, is already available in the Rigveda’s tenth book.

And then there is the hymn that turns the whole problem into a question and refuses to answer it. RV 10.121, the Hiraṇyagarbha Sūkta, praises the “Golden Embryo” from which the cosmos hatched and ends each verse with a refrain that has unsettled readers for millennia: kásmai devāya havíṣā vidhema, “to which god should we offer our worship?” The word kásmai, “to whom,” was later frozen into a proper name, Ka, “the god called Who.” The poet who wanted a name for the source could not find one and left the question standing. (I take up that refrain at length in The God Named Who; it belongs here as one more Rigvedic reach toward a One that outruns every name.)

How the Upaniṣads finished a sentence the Rigveda started

The Rigveda gives you the words “one,” “self,” “that.” It does not give you a doctrine that welds them together. That welding happens in the Upaniṣads, the speculative dialogues composed roughly between 800 and 300 BCE, which the tradition calls Vedānta, “the end of the Veda,” in both senses: the last texts, and the point of the whole thing.

What the Upaniṣads add is an equation. The absolute reality behind the cosmos (brahman) and the innermost self of a person (ātman) are declared to be the same. The Rigveda had a One out there and an “I” in here. The Upaniṣads collapse the distance between them. The claim is stated in a set of terse formulas the tradition calls mahāvākyas, “great utterances”:

The most famous is tat tvam asi, spoken nine times by the sage Uddālaka Āruṇi to his son Śvetaketu in the Chāndogya Upaniṣad. Every time the boy demands to know the hidden essence of things, the father answers with the same three syllables: that subtle reality, that is what everything is, and that you are.[5] The path to it is by negation, neti neti, “not this, not this”: the absolute is not any object you can point to, because it is the subject doing the pointing.

Set the two layers side by side and the continuity is unmistakable, and so is the leap.

Methods note. Continuity of vocabulary is not the same as continuity of doctrine. That ekam, “one,” appears in both the Rigveda and the Upaniṣads proves the later authors knew the older word. It does not prove they meant the same thing by it. Hajime Nakamura’s history of early Vedānta is the careful guide here: the Upaniṣads develop, they do not merely transcribe, and the systematic non-dualism is later still.[6]

Reading Advaita backward: Gauḍapāda and Śaṅkara

Advaita Vedānta as a school, with arguments, opponents, and a technical vocabulary, is a first-millennium-CE creation. Its decisive figures are Gauḍapāda, whose verse commentary on the Māṇḍūkya Upaniṣad (the Māṇḍūkya Kārikā, perhaps sixth century CE) pushed non-dualism to a radical edge, and his tradition’s heir Ādi Śaṅkara, active around the early eighth century, who wrote the commentaries that fixed the school’s shape for good.[7]

Śaṅkara’s core position is unsparing. Only brahman is real. The world of plurality is mithyā, neither simply real nor simply unreal, a superimposition (adhyāsa) laid over the one reality the way a snake is mistakenly seen on a coiled rope in dim light. The individual self is not a fragment of brahman or a spark from it; it is brahman, fully, right now, mistaking itself for a limited person out of ignorance (avidyā). Liberation (mokṣa) is therefore not an achievement but a recognition: you were never anything else.

$$\text{ātman} = \text{brahman}, \qquad \text{jagat} = \text{mithyā}, \qquad \text{jīva} \neq \text{separate}$$

Notice what Śaṅkara does with the old verses. He treats ekaṃ sad viprā bahudhā vadanti and the tad ekam of the Nāsadīya not as poetry reaching toward an idea but as scripture stating the idea, testimony (śruti) for a truth his arguments only clarify. For him there is no gap between the Rigvedic One and brahman. The poets, the Upaniṣadic sages, and his own commentary are one voice across two thousand years.

Here the modern reader has to hold two things at once, and this is the honest center of the whole subject.

Two observations are worth stating plainly. First, Śaṅkara is doing exegesis, not history. He reads the earlier texts through the doctrine he is defending, which is exactly what a commentator in his tradition is supposed to do. Wilhelm Halbfass’s study of how Indian and European thought have read each other is good on this: the tradition’s self-understanding is a datum about the tradition, not a neutral report on the Rigveda.[8] Second, the retrojection is not a fraud. The seeds really are in the text. Śaṅkara did not invent the One out of nothing; he found genuine non-dual verses and built a cathedral on foundations the poets had laid, whether or not the poets knew what they were founding.

Where does the balance sit? Roughly here: the Rigveda contains non-dual moments, real ones, in a handful of late hymns. It does not contain Advaita Vedānta, which needs the ātman-brahman equation of the Upaniṣads and the systematic argument of Śaṅkara to exist. The line from one to the other is real but long, and every link in it is a human being choosing to read the previous link a certain way.

graph TD
    A["RV 10.129: tad ekam, the One"] --> D["Upaniṣads: brahman = ātman"]
    B["RV 1.164.46: ekam sad, one Real"] --> D
    C["RV 10.125: Vāc, the all-containing I"] --> D
    D --> E["Gauḍapāda: Māṇḍūkya Kārikā"]
    E --> F["Śaṅkara: Advaita Vedānta"]
    F --> G["Modern global reception"]

Why a skeptical Bronze Age hymn still reads like this morning

Strip the school labels away and ask what the Nāsadīya poet was actually doing, and the answer is unnervingly current. He looked at the largest possible question, the origin of being itself, and did three things at once: he offered the best account he could, he flagged that it might be wrong, and he refused to let the uncertainty scare him into a false answer. That is not mysticism. That is method.

The astronomer Carl Sagan, no friend of religious dogma, singled out this hymn for exactly that reason, praising its “tradition of skeptical questioning and unselfconscious humility before the great cosmic mysteries.”[9] A cosmologist reading verse 6, “the gods themselves are later than creation, so who knows whence it arose,” recognizes the shape of a modern problem: any explanation of the universe that invokes something inside the universe has explained nothing. The poet saw the regress and named it, in metre, three millennia early.

This is why “show the reader, do not preach at the reader” is the right way to meet Advaita, and it is how the tradition’s best teachers have always worked. Advaita does not, at its sharpest, ask you to believe a doctrine. It hands you an instrument and asks you to look. The instrument is a question about the one thing you cannot doubt, the awareness reading this sentence, and an invitation to check whether that awareness is really the small, bounded, perishable thing you assume it to be. Neti neti is not a creed. It is a subtraction exercise. Keep removing everything you can observe as an object, and ask what is left doing the observing.

Three cautions for the modern reader who feels the pull. First, do not confuse the Rigvedic gesture with the developed philosophy; the poets glimpsed, the Upaniṣads argued, Śaṅkara systematized, and flattening the three does violence to all of them. Second, the “everything is one” line is easy to turn into sentimental wallpaper, which is precisely what the rigor of neti neti and Śaṅkara’s dialectic exist to prevent; non-duality earned by argument is a different animal from non-duality asserted by mood. Third, the reception has a politics. Deussen and, later, Vivekananda and Radhakrishnan presented Advaita as the crown of Indian thought partly in dialogue with European philosophy, and that framing has shaped what gets called “the” Hindu view. It is one powerful stream among several, not the undisputed summit.

Aside. The Rigveda itself would not recognize the word “Hinduism,” or “philosophy,” or “religion” as we use them. Its poets were ritualists and image-makers working for patrons, not metaphysicians building systems. That the boldest idea in later Indian philosophy can be traced to a few of their stranger verses is a fact about how traditions grow: the seed does not know it is a seed.

The invitation, without the sermon

Here is the whole arc in one breath. A poet doubts his own god and posits a One behind the gods. Another poet says the Real is one and the names are many. A goddess says “I am all of it.” Centuries later, sages fold the cosmos into the self and say that you are. Centuries after that, a young philosopher from Kerala reads all of it as a single sentence and argues, against every rival school, that only the One is real and you are it. And a Bronze Age hymn about not-knowing turns out to be the most intellectually honest text in the entire library.

The synthesis is this: Advaita Vedānta is best understood not as a belief the Rigveda “already had,” but as the long unpacking of a question the Rigveda was the first to ask well. The tradition’s genius was to treat doubt as a doorway rather than a defeat. Its founding scripture ends not with an answer but with a shrug at the edge of the knowable, and somehow that shrug became the seedbed of a philosophy that claims you can know the deepest thing of all, because you already are it.

If you want to feel the current for yourself rather than take my word for it, do this. Open RV 10.129 and RV 1.164.46 on the same page and read them as one continuous thought: the One that breathes before the gods, and the One that the poets keep calling by every name they have. Then read the Chāndogya’s tat tvam asi on top of them. You will not need anyone to sell you Advaita. You will have watched it grow.

For the surrounding hymns, see the companion pieces on the Nāsadīya creation hymn, the riddle hymn of Dīrghatamas, the Puruṣa Sūkta, the Devī Sūkta of Vāc, and the god named Who. Read next to the cosmic order of ṛta they stop looking like isolated flashes and start looking like a tradition thinking out loud.