Philosophy in India is essentially spiritual. It is the intense spirituality of India, and not any great political structure or social organization that it has developed, that has enabled it to resist the ravages of time and accidents of history. External invasions and internal dissensions came very near crushing its civilization many times in its history. The Greek and the Scythian, the Persian and the Moghul, the French and the English have by turn attempted to suppress it, and yet it has its head held high.
India has not been finally subdued, and its old flame of spirit is still burning. Throughout its life it has been living with one purpose. It has fought for truth and against error. It may have blundered, but it did what it felt able and called upon to do. The history of Indian thought illustrates the endless quest of mind, ever old, ever new.
Dr S Radhakrishnan
(Source: Indian Philosophy Volume 1 – Introduction)