The Principal Upanishads
“Human nature is not altogether unchanging but it does remain sufficiently constant to justify the study of ancient classics. The problems of human life and destiny have not been superseded by the striking achievements of science and technology. The solutions offered, though conditioned in their modes of expression by their time and environment, have not been seriously affected by the march of scientific knowledge and criticism. The responsibility laid on man as a rational being, to integrate himself, to relate the present to the past and the future, to live in time as well as in eternity, has become acute and urgent. The Upanishads, though remote in time from us, are not remote in thought. They disclose the working of the primal impulses of the human soul which rise above the differences of race and of geographical position . . . ”
The Upanishads represent a great chapter in the history of the human spirit and have dominated Indian Philosophy, religion and life for three thousand years . . . they have survived many changes, religious and secular, and helped many generations of men to formulate their views on the chief problems of life and existence.