At a glance
- Name: Uddalaka Aruni (उद्दालक आरुणि) — "Aruni" means son (or descendant) of Aruna; he is also called Gautama after his gotra.
- Category: Maharshi — one of the great teachers of the Upanishads.
- Son and pupil: Shvetaketu, to whom he gives his most famous teaching.
- Guru (in the Mahabharata): Ayoda Dhaumya, whose disciple Aruni of Panchala he was.
- Region: the Kuru-Panchala country of the late Vedic age.
- Texts: the Chandogya Upanishad (chapter 6), the Brihadaranyaka Upanishad, the Kaushitaki Upanishad and the Shatapatha Brahmana.
- Best known for: the teaching tat tvam asi, "you are that", one of the four mahavakyas.
Birth and family background
Uddalaka is the son of Aruna, of the Gautama gotra, and belongs to a family of Vedic ritualists and teachers in the Kuru-Panchala region. He appears in the Upanishads as an established teacher with pupils of his own, and above all as the father of Shvetaketu, a proud young scholar whose education he completes. The Kaushitaki and Brihadaranyaka Upanishads show father and son together going to other teachers to learn, which says something about Uddalaka: a famous teacher who was not ashamed to become a student again.
Life and key episodes
Aruni and the breached embankment
The Adi Parva of the Mahabharata tells how the sage Ayoda Dhaumya tested his three disciples. He sent Aruni of Panchala to close a breach in the embankment of a field. Unable to stop the water any other way, Aruni lay down in the breach himself, and stayed there. When his guru came looking for him and called, Aruni rose up out of the channel, and Dhaumya named him Uddalaka — the one who rose up, tearing through — and blessed him that all the Vedas and shastras would shine in his mind. The story is told to this day as a model of devotion to the guru.
Teaching Shvetaketu: "tat tvam asi"
In the sixth chapter of the Chandogya Upanishad, Shvetaketu returns home at twenty-four after twelve years of study, conceited and sure of his learning. His father asks whether he has learned that by which the unheard becomes heard and the unknown known. He has not. Uddalaka then teaches him: in the beginning there was only Being (sat), one without a second, and everything that exists has that Being as its root. He makes the point with homely examples: dissolve salt in water and you cannot see it, yet every sip tastes of it; break open a banyan seed and you see nothing, yet from that subtle essence the great tree grows; bees gather nectar from many flowers, but in honey the nectars no longer know which flower they came from. Each lesson ends with the same refrain: that subtle essence is the self of all this; that is the truth; that is the Self — tat tvam asi, Shvetaketu, you are that.
In the court of Janaka
In the Brihadaranyaka Upanishad (3.7), Uddalaka questions Yajnavalkya at King Janaka's assembly about the thread (sutra) that holds this world and the next together, and about the inner controller (antaryamin). Yajnavalkya answers with the famous description of the antaryamin, the immortal Self that rules every element from within without being known by it, and Uddalaka falls silent.
Achievements and contributions
- The doctrine of Being: his teaching that all things are modifications of one Being, as pots are of clay, became a foundation of Vedanta; Shankara and the later acharyas return to Chandogya chapter 6 again and again.
- A mahavakya: tat tvam asi is counted among the four great sayings of the Upanishads, assigned to the Sama Veda.
- Teaching by experiment: his lessons ask the student to do something — taste the water, split the seed, fast for fifteen days and see what memory remains — which is why many readers call him one of the earliest teachers to reason from observation.
- A line of teachers: his pupils included his son Shvetaketu, and the Brihadaranyaka names Yajnavalkya in the same teaching lineage.
Writings attributed to him
No text is ascribed to Uddalaka as its author. His teaching survives in dialogues: Chandogya Upanishad 6 (the Shvetaketu dialogue), Brihadaranyaka Upanishad 3.7 and 6.2, Kaushitaki Upanishad 1, and passages of the Shatapatha Brahmana in which he appears as a ritual authority.
Why he is revered today
"Tat tvam asi" is one of the most quoted sentences in Hindu thought, and almost every introduction to Vedanta explains it through Uddalaka's salt and banyan seed. The Mahabharata's Aruni, lying in the mud to keep his guru's field from flooding, is a favourite story for children on Guru Purnima. Together the two pictures make him a model of both: the humble disciple and the patient teacher.
Variant traditions and a historical note
Scholars generally treat the Upanishadic Uddalaka and the Mahabharata's disciple Aruni of Panchala as the same figure, though the epic story is much later than the Upanishads. The Katha Upanishad calls Nachiketa's father "Auddalaki Aruni", and some traditions connect him with Uddalaka's family, but the texts do not make the relationship clear. Uddalaka is usually placed in the late Vedic period, around the 8th–7th century BCE.
Frequently asked questions
Who was Uddalaka Aruni?
A teacher of the late Vedic age whose dialogues appear in the Chandogya and Brihadaranyaka Upanishads, best known for teaching his son Shvetaketu "tat tvam asi".
What does "tat tvam asi" mean?
"You are that": the subtle Being that is the root of everything is your own Self. It is one of the four mahavakyas of the Upanishads.
What are the examples Uddalaka uses?
Salt dissolved in water, the seed of the banyan tree, honey gathered from many flowers, rivers merging in the sea, and clay and its pots, all to show how one invisible essence underlies many visible forms.
Why was he called Uddalaka?
In the Mahabharata, after he lay in a breached field embankment for his guru Dhaumya, he rose up out of it when called, and Dhaumya named him Uddalaka, the one who rose up.
Who was Shvetaketu?
Uddalaka's son and pupil, who came home proud of his learning and was taught by his father the knowledge that makes the unknown known.
Did Uddalaka debate Yajnavalkya?
Yes. In the Brihadaranyaka Upanishad he questions Yajnavalkya about the inner controller of all things, and Yajnavalkya's answer silences him.