The old civilisation of India was a concrete unity of many-sided
developments in art, architecture, literature, religion, morals, and
science so far as it was understood in those days. But the most important
achievement of Indian thought was philosophy. It was regarded as the goal
of all the highest practical and theoretical activities, and it indicated
the point of unity amidst all the apparent diversities which the complex
growth of culture over a vast area inhabited by different peoples produced.