In the history of Western philosophy we usually find the different schools coming into existence successively. Each school predominates till another comes in and replaces it. In India, on the other hand, we find that the different schools, though not originating simultaneously, flourish together during many centuries, and pursue parallel courses of growth. The reason is to be sought perhaps in the fact that in India philosophy was a part of life. As each system of thought came into existence it was adopted as a philosophy of life by a band of followers who formed a school of that philosophy.
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