Sri Adi Shankara
He was the most acute of philosophers. He was the most devoted of devotees. He preached the doctrine of the Self to a point he practically denied God any part in the regulation of our affairs. At the same time, he enunciated the seemingly contradictory doctrine that all our activities and its results depended on God and God alone.
Lord Shiva, also known as Dhakshinamurthy, who spreads the Universal Truth not by words but by his silence and by his sign of his hand which is held in the form of "Chin Mudra".
About 2500 years ago, when the spiritualisation of the people greatly reduced, all the Gods and the Rishis went to Kailash and pleaded with Lord Shiva to revive the world. Lord Shiva agreed with their request and informed that he will be born in this world. Lord Brahma, Indra and others also agreed to be born in this world to help Lord Shiva.
Jagadguru Sri Adi Sankaracharya was the greatest exponent of the doctrine of Advaita Vedanta and a savior of Vedic Dharma. Salutations to Sankara, who is an ever shining star on the sky of Indian philosophy.
The existence of Vedic Dharma in India today is due to Sankara. The forces opposed to Vedic religion were more numerous and powerful at the time of Sankara than they are today. Still, single-handed, within a very short time, Sankara overpowered them all and restored the Vedic Dharma and Advaita Vedanta to its pristine purity in the land pure knowledge and spirituality.