The Upanishads

He (the Self) is all-encircling, resplendent, bodiless, spotless, without sinews, pure, untouched by sin, all-seeing, all-knowing, transcendent, self-existent; He has disposed all things duly for eternal years.

This text defines the real nature of the Self. When our mind is cleansed from the dross of matter, then alone can we behold the vast, radiant, subtle, ever-pure and spotless Self, the true basis of our existence.