Adi Sankara's Rich contribution to Indian Philosophy

Sankaracharya contributed a lot to the Indian philosophy and a brief review on his approach and contributions for knowing ourselves. His Bhaja govindam verse is just direct wake up call for our know thyself quest.
Sankaracharya was a monk, (sanyasi ),philosophy guru, mystic saint from south India who changed the course of worship, understanding of the scriptures and the meanings of philosophy. He lived only 32 years. But , within a span of 20 years of time, he worked so much , the entire Indian philosophy gained lot of health, breathed fresh air and logical approach to customs and rite reached its peak. He started or supported the advaita philosophy (non dual) and made every body to agree to it and surrender to it because of his great intelligence and knowledge. As truth also is non dualism, every body should accept it. However the dualism is also correct (dwaita siddhanta). How can two things , each contradicting the other , can be true at the same time? Yes, that is the greatness of God. Gods creation and his mathematics are different from our maths.For example, in our maths, 1+1=2, but in God's mathematics, it is 1+1=1, 1+1+1+1=1 ; The figure one implies existence. What ever existing will exist for ever, it wont change. The famous sloka from Upanishads, if you remember " Poornamadah, poornamidam, poornasya poorna maadayate..." (That is complete , this is complete, if you subtract THAT from THIS THAT only resides.
So, in such mathematics and Maya creation, dualism and non dualism exists, both try to explain HIM. He is explained by these two and many more also. But , from our point of angle, non dualism stands good for greatest logic. Non dualism says, that there exists only one thing that is supreme Brahman. Nothing else other than that and it is not second to anything, and no second to it also.
This great principle was spread across the country by Adi (The first) Sankara acharya and from then on it is the basic principle to test or to explain any theory.Adi sankaracharya was born in kerala , around 300AD in a village called Kaladi. He took sanyasa at the age of 7 and there on he was wandering across the country, defeating many pundits in the philosophical arguments. He made many great scholars as his disciples , because of his great philosophy and also because of his personal greatness. He established many centers in India to spread this Philosophical education . These are link Shaolin temples in china, spreading martial arts. Each center will have highest order monk heading the activities. Kanchi peetha, sringeri peetha, joshi peetha etc. Sankaracharya (Sankara) wrote wonderful books , commentaries on many Upanishads and epics and these are basis for reference for the contemporary saints and gurus of present day.
One important thing from Sankara , we have to note is: He noticed that neither the pure bhakti worshippers are attaining moksha or salvation nor the pure philosophers . He created many stotras, or god praising songs for worshipping different gods. he indirectly suggested that one should purify his mind and body with these stotras, psalms and walk on the path of self realization through philosophy. Because , nirvana, or salvation comes only through supreme self knowledge. "jnanad eva tu kaivalyam". (salvation only through supreme knowledge). The great contemporary philosopher sri sundara chaitanya mostly depends on the reviews, commentaries provided by Adi sankaracharya to explain any critical issue in the religion, philosophy. Thus the great mystic saint sankaracharya contributed very much for mankind for their self realization, to help them to know themselves.