The fourth sheath is vijñānamaya-kośa (Vijñānamaya Kośa)—the stratum of intelligence. This is the seat of discrimination, perception, and decision-making. Here manifests that knowing consciousness—"I know." The vijñānamaya-kośa governs the mind, giving birth to moral sense and conscience. Yet even this is not the Self, for its knowledge is reflected consciousness—cidābhāsa. Just as the sun's reflection appears in a mirror, so the Self's reflection appears in the intellect; but a reflection is not the sun itself. Thus the vijñānamaya-kośa too is not the Self; it is merely the Self's reflection.
The fifth and final sheath is ānandamaya-kośa (Ānandamaya Kośa)—the veil of bliss. This is connected with the causal body, manifesting in the state of deep sleep. Then mind, senses, and intellect are absorbed, and only ignorance-veiled peace is experienced. This happiness is the comfort found within unconsciousness; it is not the Self's essential bliss, but rather bliss wrapped in the covering of ignorance. Here is peace, but no knowledge; thus this stratum too is not the Self.
When the seeker transcends these five sheaths one by one—"I am not the body, I am not the vital force, I am not the mind, I am not the intellect, I am not even the blissful"—then he becomes established in the Self's true nature. Then is revealed that great utterance—"Ahaṃ brahmāsmi"—I am Brahman, I am consciousness itself.
This Self is beyond birth and death, untouched by body or mind. Just as the sun, though veiled by clouds, remains ever radiant beyond them, so the Self is never obscured; its brilliance only seems hidden due to limiting adjuncts. When all these adjuncts—food, vital force, mind, intellect, bliss—when all these divisions are transcended, the knower becomes kośātīta (Kośātīta)—that is, established in the Self beyond all sheaths. Then his experience is singular—"I am eternal consciousness, I am eternally unchanging, I am bliss itself."
The seeker of Self-knowledge gradually advances along the path of ātma-anātma-viveka (Ātma-Anātma-Viveka)—that is, "separating oneself from what is not the Self." This is Vedanta's fundamental practice. Here the inquirer observes each sheath or covering that veils the Self and through reason and direct experience comes to understand—"This am I not." This discriminative understanding is neti-neti (Neti-Neti)—"not this, not that"—through which all limiting adjuncts fall away.
First he realizes—"I am not the body"—because the body is inert, changeable, and dissolves with death. Then he understands—"I am not the vital force"—because I witness the vital force's rise and fall; I am its witness. Then comes observation of the mind—the mind too comes and goes, so I am watching it; I am not the mind. Subsequently, analyzing the intellect or vijñānamaya-kośa, he understands—the intellect makes decisions, doubts, but I am witness to that intellect too; therefore I am not the intellect either. Finally he transcends even the peaceful bliss of ānandamaya-kośa—because that bliss is ignorance-veiled, temporary, and bound to ignorance.
Thus when all sheaths or adjuncts are transcended, what remains is pure consciousness—which is neither body, nor mind, nor intellect, nor any shadow of sensation—but the continuous self-witness within all things. This direct Self-vision (Ātma-Darśana) is no thought or concept; it is self-experience—where the distinction between knower, knowledge, and known dissolves.
This state is called turīya (Turīya)—the fourth state, which transcends all three: waking (the sense-perceived world in waking state), dreaming (the inner conscious world), and deep sleep (unconscious peace). The Upaniṣad declares—"Na bahiṣprajñam nā antaḥprajñam, na ubhayataḥprajñam, na prajñānaghanaṃ, na prajñaṃ, na aprajñam—sa ātmā sa vijñānīyaḥ." (Māṇḍūkya Upaniṣad, 7)
Through this mantra, the Self's fourth state or turīya is defined as the supreme non-dual reality. The mantra essentially indicates Brahman's nature negatively—that is, what Brahman is not.
1. Na bahiṣprajñam (Nā bahiṣprajñam): Brahman is not the knower of the external world like the waking state.
2. Nā antaḥprajñam (Nā antaḥprajñam): He is not the knower of the internal world like the dream state.
3. Nā ubhayataḥprajñam (Nā ubhayataḥprajñam): He is not the knower of both worlds—waking and dream.
4. Na prajñānaghanaṃ (Na prajñānaghanaṃ): He is not the mass of knowledge like deep sleep (where all experience is unified).
5. Na prajñaṃ (Na prajñaṃ): He is not an ordinary knower (which occurs through mind and intellect).
6. Na aprajñam (Na aprajñam): He is not completely unknowing or unconscious.
The Upaniṣad says: Sa ātmā sa vijñānīyaḥ (Sa ātmā sa vijñānīyaḥ), meaning—That being alone is the Self; He alone should be known.
Through this negative description, the Upaniṣad establishes that turīya is pure consciousness existing beyond all worldly and mental experience, which is the sole non-dual truth. That is, this turīya consciousness is not external knowledge, not internal knowledge, not the unconscious density of sleep either; it is neither omniscience nor ignorance. It is that Self—which is itself eternally awake witness, yet belongs to no state.
In the turīya state the seeker knows—"I am that consciousness which illuminates the three states of waking, dream, and deep sleep, but never itself changes." In this state he becomes established in his own nature—immovable, unchanging, silent, yet awake.
According to Vedanta, this realization itself is liberation—because here all duality, all proof, all phenomenal world dissolves. There remains only that one consciousness, which never is born, never dies, which is the background of all experience, yet part of no experience. Thus turīya alone is the Self's supreme abode—eternal nirvāṇa, eternal witness, eternally awake supreme peace.
This realization then leads the Self-seeker to the next stage—where knowledge, action, and liberation become complementary to each other. Vedanta explains this threefold path as steps of one continuous practice—karma-kāṇḍa (Karma Kāṇḍa) prepares the mind, jñāna-kāṇḍa (Jñāna Kāṇḍa) grants liberation, and perfection comes through the synthesis of both.
The first stage is karma-kāṇḍa—that is, duty, sacrifice, charity, discipline, worship, and selfless action. Its purpose is not liberation, but citta-śuddhi (Citta-Śuddhi)—making the mind clean, steady, and transparent. In the Gītā, Śrī Kṛṣṇa says—"Yogasthaḥ kuru karmāṇi, saṅgaṃ tyaktvā Dhanañjaya." (Gītā, 2.48) That is, established in yoga, abandoning attachment, perform your duties. This verse articulates one of the fundamental principles of karma yoga. Through this teaching, Śrī Kṛṣṇa tells Arjuna what the proper mindset should be while performing action:
Yogasthaḥ kuru karmāṇi (Yogasthaḥ kuru karmāṇi): Performing action while established in yoga. Here 'yoga' means equipoise or equanimity. That is, keeping the mind unperturbed and peaceful in both success (siddhi) and failure (asiddhi).
Saṅgaṃ tyaktvā Dhanañjaya (Saṅgaṃ tyaktvā Dhanañjaya): One must act abandoning attachment to or desire for the fruits of action.
Through this verse, Śrī Kṛṣṇa has explained that the path to liberation through karma yoga is not renouncing action, but performing action with detachment, abandoning attachment.
Action destroys ego and attachment to results. It prepares the mind for knowledge, because an impure mind can never receive Self-knowledge. Śaṅkarācārya too has said—"Certainly action is not the cause of liberation, but the cause of mental purification." Thus action is the means, knowledge is the fruit.
In Advaita Vedanta, "Na hi jñāner sannidhau karma vidyate"—this statement clarifies a fundamental philosophical position—liberation (mokṣa) is the fruit of knowledge alone, not action. Here from Śaṅkarācārya's perspective, "in the presence of knowledge" means when Self-knowledge manifests, all effectiveness of action is spontaneously destroyed, just as darkness vanishes at sunrise. Because the source of action is ignorance (avidyā), and knowledge completely destroys that ignorance.
To understand the matter, Vedanta explains this knowledge-action relationship on three levels.
First, the domain of action. Action always stands on the foundation of duality. For action to occur requires the distinction between agent (kartā), action (karma), and result (phala)—this triad. This very distinction arises from ignorance, because only when the Self is considered identical with body and mind do the thoughts "I am the doer," "I am the enjoyer," "I will do" arise. This body-identification is action's driving force. In the Gītā, Śrī Kṛṣṇa says—
"Prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ.
Ahaṅkāravimūḍhātmā kartāham iti manyate.." (Gītā, 3.27)
This verse highlights the fundamental difference between the Self and prakṛti and the bondage created by ego.
Prakṛti and guṇas: According to the Gītā, all worldly actions are performed by prakṛti's three guṇas—sattva, rajas, and tamas.
The Self's detachment: The Self is merely witness to all these actions, not the doer himself.
Ego and bondage: One who is deluded by ego (ahaṅkāravimūḍhātmā) thinks "I am the doer" (kartāham iti manyate). That is, when the individual soul forgets that all actions are being performed by prakṛti, and due to false ego considers itself the doer, then it becomes bound by the results of action.
This verse establishes the fundamental basis of karma yoga—the path to liberation is not renouncing attachment to results, but abandoning the ego of doership. Prakṛti's guṇas perform all actions; but one who ignorantly considers himself the doer is deluded. As long as the ego of doership remains, action will continue, and with it will remain hope for results, bondage, and the chain of rebirth.
Second, knowledge's effect. Knowledge here is not mere intellectual information, but the realization of Self-Brahman non-difference—where one knows, "I am not the doer, I am the eternal witness, eternal consciousness Brahman." When this knowledge dawns, the ignorance which is action's foundation collapses.
Knowledge is like light—just as lighting a lamp eliminates darkness, so when knowledge is present, the threefold structure of doer-action-result disappears. Then the seeker sees—"Doer, action, result, body, mind—all are merely adjuncts; I am eternal consciousness, within which all these are mere reflections." In this realization action no longer affects, because action's effectiveness exists only when ignorance remains alive.
Third, conclusion. Just as light's presence eliminates proof of darkness, so when Self-knowledge dawns, action too becomes unnecessary. Action then remains limited only to prārabdha for sustaining the body—as long as the body persists, action's momentum will continue; but it cannot touch the knower. The Gītā (4.37) states—
"Yathaidhāṃsi samiddho'gniḥ bhasmasāt kurute'rjuna.
Jñānāgniḥ sarvakarmāṇi bhasmasāt kurute tatha.."
This verse describes the supreme power of knowledge or Self-knowledge.
Its meaning: O Arjuna, just as blazing fire reduces wood to ashes, so the fire of knowledge (jñānāgniḥ) reduces all of a person's actions to ashes.
This verse highlights the supreme capacity of jñāna yoga and the importance of Self-knowledge in the process of attaining mokṣa through a powerful metaphor:
The metaphor—blazing fire (samiddho'gniḥ), wood (edhāṃsi): Wood is taken as our actions or results of actions (especially accumulated sins and merits that create bondage). Just as accumulated wood further feeds fire, so accumulated results of action bind the individual soul in the cycle of birth and death (saṃsāra).
Fire (agniḥ): Here fire is Brahman-knowledge or Self-knowledge. Just as fire naturally reduces whatever comes in contact with it to ash, so knowledge naturally exhausts the results of action.
Knowledge's role—jñānāgniḥ sarvakarmāṇi bhasmasāt kurute: In this verse Śrī Kṛṣṇa says that the fire of knowledge (jñānāgniḥ) reduces all of a person's actions to ashes.
Ignorance-Knowledge: 33
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