Chandogya Upanishad
Author & Thinker
One of the principal Upanishads of ancient Indian philosophy, believed to have been composed between 800 and 600 BCE during the Vedic period. It contains some of the most important early formulations of Vedantic philosophy, including the mahavakya (great sayings) that became central to Advaita thought. The text is embedded in the Sama Veda tradition.