The Upanishads: Core Teachings on Atman, Brahman, and Liberation

What Are the Upanishads?

The Upanishads belong to the final layer of the Vedas, the sacred literature of ancient India. The Vedic corpus is structured in four layers: Samhitas (hymns), Brahmanas (ritual commentaries), Aranyakas (forest treatises), and Upanishads (philosophical dialogues). The Upanishads are classified as Vedanta, literally "the end of the Vedas," both in the sense of concluding the textual tradition and in the sense of presenting its ultimate meaning.

The word "Upanishad" comes from three Sanskrit elements: upa (near), ni (down), and shad (to sit). The image is of a student sitting at the feet of a teacher, receiving teachings that cannot be communicated through public recitation but require the intimacy of direct transmission. This is not poetry or metaphor. The Upanishads consistently frame their teachings as secret (rahasya), intended for prepared students, not for general circulation.

Tradition recognizes 108 Upanishads, a number with sacred significance in Indian culture. Of these, 10 to 13 are considered "principal" (mukhya), meaning they are accepted by all major Vedantic schools as authoritative. These principal Upanishads are the texts on which Shankara, Ramanuja, and Madhva wrote their commentaries, and they form the philosophical foundation that all subsequent Indian thought either builds on or argues against.

Historical Context and Dating

Patrick Olivelle, whose Oxford University Press translations (1996, 1998) are the standard scholarly editions, dates the principal Upanishads across several centuries:

The earliest Upanishads were composed in a period of intense intellectual ferment in the Ganges Valley. The older Vedic religion of fire sacrifice and priestly ritual was being questioned. The Buddha (c. 5th century BCE), Mahavira (founder of Jainism), and the Upanishadic sages were all part of this questioning. The Upanishads represent the Brahmanical tradition's own internal revolution: a movement from external ritual to interior realization, from sacrifice to knowledge.

The Core Teaching: Atman Is Brahman

The single proposition that runs through every major Upanishad is the identity of Atman (the individual self, the innermost awareness of each being) and Brahman (the universal absolute, the ground of all existence). This is not a theological claim that a personal God created the universe. It is a metaphysical claim that the awareness present in each conscious being is identical with the awareness that constitutes the foundation of reality itself.

The four mahavakyas (great sayings) express this identity from four angles:

Paul Deussen, in "The Philosophy of the Upanishads" (1906, English translation), argued that the Atman-Brahman identity represents "the most important philosophical discovery ever made." Whether or not one accepts this claim, it is undeniable that the idea has shaped the entire subsequent history of Indian philosophy, and through its Western reception, has influenced European thinkers from Schopenhauer to Heidegger.

The Principal Upanishads: An Overview

The Brihadaranyaka: Yajnavalkya's Dialogues

The Brihadaranyaka (literally "great forest teaching") is the longest Upanishad and, with the Chandogya, the oldest. Its philosophical heart is the series of dialogues involving the sage Yajnavalkya, who appears in the court of King Janaka of Videha and in conversations with his wife Maitreyi.

The Yajnavalkya-Maitreyi dialogue (2.4 and 4.5) is remarkable. When Yajnavalkya decides to renounce the world, he offers to divide his wealth between his two wives. Maitreyi asks: "If the whole earth, full of wealth, belonged to me, would I become immortal through that?" Yajnavalkya answers: "No. Your life would be like the life of the wealthy. There is no hope of immortality through wealth." Maitreyi responds: "What should I do with that which will not make me immortal? Tell me, sir, what you know."

Yajnavalkya then teaches the Atman doctrine: everything is loved not for its own sake but for the sake of the Self. Husband, wife, children, wealth, gods: all are loved because the Self that loves is in each. The Self (Atman) is what should be seen, heard, reflected upon, and meditated on. When the Self is known, all is known.

His method of describing Brahman is the via negativa: neti neti ("not this, not this"). Brahman cannot be described by any positive attribute because it is beyond all categories. It is not large or small, not conscious or unconscious (in the ordinary sense), not being or non-being. This apophatic approach parallels the negative theology of Pseudo-Dionysius in the Christian tradition and the Hermetic teaching that God "is not any of the things that exist" (Corpus Hermeticum V).

The Chandogya: Tat Tvam Asi

The Chandogya Upanishad's most famous passage is the dialogue between Uddalaka Aruni and his son Shvetaketu (6.1 to 6.16). Shvetaketu has returned from twelve years of Vedic study, "conceited, considering himself well-read, and arrogant." His father asks him: "Did you ask for that instruction by which the unheard becomes heard, the unperceived becomes perceived, the unknown becomes known?"

Uddalaka then teaches through a series of analogies. A lump of clay: by knowing one lump, all objects of clay are known, for the modification is only a name, while the reality is clay. Honey made by bees from the nectar of different trees: the individual nectars lose their separate identity in the honey, just as individual beings lose their apparent separateness in Brahman.

After each analogy, Uddalaka concludes with the refrain: "Tat tvam asi, Shvetaketu" (That thou art, Shvetaketu). The repetition, nine times in the text, drives the teaching inward. It is not an idea to be understood once and filed away. It is a recognition to be deepened through repeated contemplation until it becomes the direct experience of the listener.

The Katha: Nachiketa and Death

The Katha Upanishad presents its teaching through a narrative frame. The boy Nachiketa is sent by his father to Yama, the god of Death. When Nachiketa arrives at Yama's abode, Yama is absent for three days. On his return, Yama grants Nachiketa three boons to compensate for the discourtesy.

Nachiketa's third request is for the knowledge of what happens after death: is there a self that survives, or is death the end? Yama tries to dissuade him, offering wealth, long life, kingdoms, beautiful women. Nachiketa refuses everything: "These things are temporary. They wear out the vigour of all the senses. The whole of life is short. Keep your horses, keep your dancing, keep your singing."

The Mandukya: AUM and the Four States

The Mandukya Upanishad is only 12 verses long, but Gaudapada (Shankara's teacher's teacher) considered it sufficient for liberation if properly understood. His commentary (Mandukya Karika) runs to several hundred verses, drawing out implications that the original text compresses into extraordinary density.

The Mandukya analyses the syllable AUM (OM) and maps it to four states of consciousness:

The argument is precise. In waking, you are aware of external objects. In dreaming, you are aware of internal objects. In deep sleep, you are aware of nothing, yet "you" still exist (you wake up and report: "I slept well"). What is the "you" that persists through all three states, witnessing each but identified with none? That is turiya, the fourth state, which is not really a "state" at all but the awareness in which states arise and dissolve. That awareness is Atman. That Atman is Brahman.

Shankara's Commentaries

Adi Shankara (788 to 820 CE, dates debated) wrote commentaries (bhashya) on the principal Upanishads, the Brahma Sutras, and the Bhagavad Gita. These three sets of commentaries, taken together, form the prasthanatrayi (triple canon) of Advaita Vedanta.

Shankara's reading of the Upanishads is radical. He argues that every Upanishadic passage, properly understood, teaches one thing: the identity of Atman and Brahman. Passages that seem to describe a personal God, a created world, or individual souls are, for Shankara, concessions to students who are not yet ready for the highest teaching. They are not false, but they are provisional (vyavaharika), belonging to the realm of conventional truth rather than ultimate truth (paramarthika).

This hermeneutic strategy allowed Shankara to create a unified reading of texts that, read independently, seem to say different things. The Moksha article discusses how Ramanuja and Madhva offered competing readings of the same passages.

The Upanishads and Hermetic Thought

The parallels between Upanishadic and Hermetic thought are striking enough to have attracted scholarly attention since the 19th century.

The Upanishadic "Atman is Brahman" finds a direct counterpart in the Hermetic teaching that the human nous (mind/spirit) is of the same substance as the divine Nous. The Poimandres states: "Mind, the Father of all, being life and light, brought forth Man, a being like himself." The human being is not merely created by God but is, at the deepest level, made of divine consciousness itself.

The Mandukya's four states of consciousness parallel the Hermetic conception of different levels of reality, each requiring a different mode of awareness. The Hermetic axiom "As above, so below" expresses the same insight as the Upanishadic mahavakya: the microcosm (individual awareness) and the macrocosm (universal reality) are not merely similar but identical in essence.

Whether these parallels reflect historical contact (through the Indo-Greek kingdoms, the Silk Road, or the cosmopolitan intellectual culture of late antiquity) or independent philosophical discovery is debated. The Hermetic Synthesis Course examines these cross-cultural convergences in detail.

Western Reception: From Duperron to Schrodinger

The Upanishads entered Western consciousness through Abraham Hyacinthe Anquetil-Duperron's Latin translation of a Persian version of 50 Upanishads, published in 1801-1802 as "Oupnekhat." Arthur Schopenhauer encountered this translation and declared it "the most rewarding and most elevating reading which is possible in the world. It has been the solace of my life and will be the solace of my death."

Schopenhauer's reading of the Upanishads influenced his "The World as Will and Representation" (1818/1844), which in turn influenced Nietzsche, Wagner, Wittgenstein, and the entire trajectory of 19th and 20th century European philosophy.

Erwin Schrodinger, the Nobel Prize-winning physicist who formulated the wave equation fundamental to quantum mechanics, wrote in "What is Life?" (1944) and "My View of the World" (1961) that the Upanishadic concept of a single consciousness underlying all individual minds was "the grandest of all thoughts" and provided the most satisfying philosophical framework for understanding the relationship between consciousness and the physical world.