Adi Shankara (early 8th century CE) was a Hindu philosopher from Kaladi in present day Ernakulam district, Kerala, India. He was the first in the tradition to consolidate the siddhanta ("doctrine") of Advaita Vedanta. He wrote commentaries on the Prasthana Trayi. A famous quote from Vivekacudamani, one of his prakarana granthas that succinctly summarises his philosophy is:
Brahma satyam jagat mithya, jivo brahmaiva naparah
Brahman is the only truth, the spatio-temporal world is an illusion, and there is ultimately no difference between Brahman and Atman (individual self).
- Source: http://en.wikipedia.org/wiki/Adi_Shankara
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