Bertrand Russell rightly said: "Unless men increase in wisdom as much as in knowledge, increase in knowledge will be increase in sorrow." While the Greeks and the others specialized in the subject of man in society, India specialized in man in depth, man as the individual, as Swami Ranganathananda puts it. This was one ruling passion of the Indo-Aryans in the Upanishads. The great sages of the Upanishads were concerned with man above and beyond his political or social dimensions. It was an inquiry, which challenged not only life but also death and resulted in the discovery of the immortal and the divine self of man.
Shaping the Indian Culture
The Upanishads gave a permanent orientation to Indian culture by their emphasis on inner penetration and their wholehearted advocacy of what the Greeks later formulated in the dictum "man, know thyself." All subsequent developments of Indian culture were powerfully conditioned by this Upanishadic legacy.The Upanishads reveal an age characterized by a remarkable fervent of thought and inspiration. The physical and mental climate that made it possible is the land of plenty that was India. The entire social milieu of the Indo-Aryans was ripe with great potentialities. They had found leisure to think and ask questions. They had the choice to utilize the leisure either to conquer the outer world or the inner. With their mental gifts, they had turned their mental energies to the conquest of the inner world rather than of the world of matter and life at the sensate level.

