You Are The Supreme Light by Adi Shankara
Adi Shankara was one of the greatest philosophers of India. Probably born in the eighth century CE in modern Kerala, he established the doctrine of Advaita Vedanta and unified the six main schools of Hinduism. He travelled across the Indian subcontinent—from Kanyakumari in the south to Kashmir in the north and Dwarka in the west to Puri in the east—propagating his philosophy through debates and discourses, establishing monasteries and monastic orders. He participated in philosophical debates with orthodox schools of Hinduism and heterodox traditions. He established several mathas or monasteries, inspired by the ancient ashrams (hermitages), all over the country, which have ensured the continuity of his teachings. By the time he died at the age of thirty-two, he had produced a cornucopia of commentaries on ancient Indian texts as well as original philosophical works which contain some of the greatest gems of human thought on the concept of oneness with the Supreme Being, caste and equality, meditation, knowledge, self-realization, moksha, pride, attachment, maya and much more.