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Adi Shankara and Advaita Vedanta
c. 700–750 or 788–820 (debated)· Founder, prophet or teacher· Hindu, Buddhist, Jain & Sikh
Debated by scholarsHistorians and scholars disagree.
An Indian philosopher-monk who systematized Advaita ('non-dual') Vedanta, teaching that the self and ultimate reality, Brahman, are one.
See it on the World Religions map →What it is
Born in Kerala, tradition says, Shankara became a wandering monk and wrote commentaries on the Upanishads, the Bhagavad Gita and the Brahma Sutras. He taught that only Brahman is fully real; the world of separate things is maya, an appearance, and liberation comes from knowing that one's true self (atman) is Brahman. Tradition says he debated rivals across India, founded four monasteries (mathas) at its four corners, and died at 32.
Why it matters
Advaita became one of Hinduism's most influential philosophies; his monastic orders still exist, and through Vivekananda his ideas became the face of Hindu thought in the West.
Life, legacy and sources
His commentaries survive, though scholars accept only some works attributed to him as authentic; his biographies, the Shankara Digvijayas, were written centuries later and are largely legendary.
Questions and debates
His dates, 700s or around 800, are disputed; scholars also debate how much his thought borrowed from the Buddhist philosophy he argued against.
Connections (3)
▸Adi Shankara and Advaita Vedanta interpreted UpanishadsHistorical record
The connection
Shankara wrote commentaries on the principal Upanishads, arguing that their core teaching is the identity of the self (atman) and Brahman, summed up in phrases like 'You are that' (tat tvam asi). He read them as texts of liberating knowledge, not ritual guides, making them the scriptural foundation of Advaita Vedanta.
When and where
India, 8th century (dates debated), in commentaries on about ten principal Upanishads, including the Brihadaranyaka and Chandogya.
Historical evidence
His commentaries survive and are studied in Advaita monasteries today; scholars accept the main Upanishad commentaries as his, though some other works bearing his name are not.
Questions and debates
Other Vedanta schools, led by Ramanuja and Madhva, argued that the Upanishads teach a real difference between God and souls; the debate continues within Hinduism.
▸Adi Shankara and Advaita Vedanta argued against and, legend says, helped eclipse BuddhismDebated by scholars
The connection
Shankara criticized Buddhist philosophy, especially its denial of a lasting self, in his commentaries. Later legends say he defeated Buddhist monks in debates across India and revived Vedic religion. Buddhism did fade in India, but it lasted centuries after him, under Pala kings, until monasteries like Nalanda were sacked around 1200.
When and where
India, 8th century in his writings; the debate legends come from Shankara biographies (Digvijayas) written from about the 1300s onward.
How do we know?
His critiques of Buddhist schools are in his Brahma Sutra commentary. His role in Buddhism's decline rests mainly on these late legends, not contemporary evidence.
Questions and debates
Most historians credit Buddhism's decline to lost royal patronage, absorption into Hindu devotion and Turkic raids. Ironically, critics accused Shankara of being a 'hidden Buddhist'.
▸Swami Vivekananda popularized Adi Shankara and Advaita VedantaHistorical record
The connection
Vivekananda made Shankara's Advaita Vedanta, the teaching that the self (atman) is one with ultimate reality (Brahman), the centerpiece of Hinduism for modern audiences. He recast it as 'Practical Vedanta': if God is in everyone, serving people is worship, linking an ancient monastic philosophy to social work.
When and where
Lectures in the US, Britain and India, 1893–1902; the Vedanta Societies and the Ramakrishna Mission spread his version.
Historical evidence
His Complete Works repeatedly cite Shankara and the Upanishads; scholars such as Anantanand Rambachan analyze how he adapted Advaita.
Questions and debates
Scholars argue his Vedanta differed from Shankara's, stressing experience and service over scripture and renunciation, and made one school seem to speak for all Hinduism.