Ādi Śaṅkarācārya

Ādi Śaṅkarācārya is the most renowned teacher of Advaita (non-dual) Vedānta. Born in Kālāḍi, Kerala, to Brāhmaṇa parents, he renounced the world early in life after receiving his mother’s blessing. He traveled across India on foot, engaging in philosophical debates, composing commentaries, and re-establishing the Vedic tradition of monasticism. In his thirty-two years, he accomplished a synthesis of Indian philosophy that has influenced every subsequent school of thought.

The Historical Context

Before Śaṅkara, Buddhism had dominated Indian intellectual life for nearly a millennium. The Mīmāṃsā school of Vedic ritualism had also gained prominence, interpreting the Vedas primarily as injunctions for action rather than as sources of knowledge about the self. The Bādarāyaṇa’s Brahma Sūtras had synthesized the Upaniṣadic teachings, but their meaning was contested by multiple commentators holding dualist and realist positions.

Śaṅkara entered this landscape and argued, against both the Buddhists and the Mīmāṃsakas, that the Upaniṣads teach a single, non-dual reality (Brahman) that is identical with the innermost self (Ātman). His achievement was not originality in the modern sense - he claimed only to be restoring the true meaning of the Upaniṣads - but his clarity, rigour, and comprehensiveness were unparalleled.

Major Works

Commentaries (Bhāṣyas)

• Brahma Sūtra Bhāṣya - Śaṅkara’s magnum opus. The introductory section, known as the Adhyāsa Bhāṣya, is a philosophical masterpiece that establishes the concept of superimposition (adhyāsa) as the key to understanding how the non-dual Brahman appears as the world of multiplicity. This commentary established the Advaitic interpretation of the Brahma Sūtras.
• Commentaries on ten principal Upaniṣads - including the Bṛhadāraṇyaka, Chāndogya, Taittirīya, Aitareya, Kaṭha, Muṇḍaka, Praśna, Māṇḍūkya, Kauṣītaki, and Śvetāśvatara Upaniṣads.
• Bhagavad Gītā Bhāṣya - The earliest extant commentary on the Gītā, establishing the harmony of jñāna-yoga, karma-yoga, and bhakti-yoga under the overarching framework of Advaita.

Independent Works (Prakaraṇa Granthas)

• Vivekacūḍāmaṇi (The Crest-Jewel of Discrimination) - A manual of Advaitic sādhana, guiding the seeker through sādhana-catuṣṭaya, the nature of the Self, the five kośas, and the method of self-inquiry.
• Ātma Bodha (Self-Knowledge) - A concise summary of Advaita in 68 verses, used as the foundational text for Vedāntic study in many traditions.
• Tattva Bodha (Knowledge of Reality) - An introductory text explaining the basic categories of Vedānta.
• Upadeśa Sāhasrī (A Thousand Teachings) - A comprehensive work in both prose and verse, structured as direct teachings to a disciple.
• Moha Mudgara (Bhaja Govindaṁ) - A devotional hymn warning against attachment to worldly pursuits.

Stotras

Śaṅkara composed numerous hymns in praise of various deities, including the Soundarya Lahari (on Devī), Śivānanda Lahari, Sadāśiva Stotram, and stotras on Śiva, Viṣṇu, Devī, Gaṇeśa, and Subrahmaṇya. These are remarkable for combining poetic beauty with profound philosophical content.

Disciples and the Maṭha System

Śaṅkara established four maṭhas (monasteries) at the four cardinal directions of India to preserve and disseminate the teaching:

Maṭha	Location	Direction	First Maṭhādhipati
Jyotir Maṭha	Badrinath	North	Toṣala (Toṭaka)
Kālikā Maṭha	Dwarka	West	Hastāmalaka
Śāradā Maṭha	Sringeri	South	Sureśvara
Govardhana Maṭha	Puri	East	Padmapāda

Each maṭha is associated with one of the four Vedas and one of the four mahāvākyas (great sayings). The heads of these maṭhas (Śaṅkarācāryas) continue to this day as authoritative teachers in the Advaita tradition.

Philosophical Contributions

Adhyāsa (Superimposition)

Śaṅkara begins his Brahma Sūtra commentary with an analysis of adhyāsa - the natural but erroneous tendency to superimpose the body-mind complex on the Self, and the world on Brahman. This concept is the cornerstone of his entire system.

Vivarta Vāda (Doctrine of Apparent Causation)

Unlike earlier Vedāntins who held that the world is a real transformation (pariṇāma) of Brahman, Śaṅkara argued that it is an apparent transformation (vivarta). The world appears in Brahman like a mirage in the desert - real as appearance but not as a separate reality.

Three Levels of Reality

Śaṅkara distinguished three orders of reality: pāramārthika (absolute, Brahman alone), vyāvahārika (empirical, the world of everyday experience), and prātibhāsika (apparent, like a dream or mirage). These distinctions allow him to affirm the reality of the world at the empirical level while denying its ultimacy.

The Mahāvākyas

Śaṅkara gave central importance to the four mahāvākyas (great sentences) from the Vedas, particularly “Tat tvam asi” (That thou art) and “Ahaṁ brahmāsmi” (I am Brahman), as the direct means of liberating knowledge.

Legacy

Śaṅkara’s influence extends far beyond the Advaita tradition. His commentaries set the standard for all subsequent Vedāntic writing, and his monastic order has preserved Vedic learning for over twelve centuries. Every major thinker in the Indian tradition - whether they agreed with him or opposed him - had to contend with his arguments. He is, without question, the single most influential philosopher in the history of Indian thought.