The precursors of perfection in yoga, they say, are lightness and healthiness of the body, absence of desire, clear complexion, pleasantness of voice, sweet odour and slight excretions.

Yajur Veda, Svetasvatara Upanishad, Part I, Chapter II, 13

As gold covered by earth shines bright after it has been purified, so also the yogi, realising the truth of Atman, becomes one with the non-dual Atman, attains the goal and is free from grief

Yajur Veda, Svetasvatara Upanishad, Part I, Chapter II, 14

And when the yogi beholds the real nature of Brahman, through the Knowledge of the Self, radiant as a lamp, then, having known the unborn and immutable Lord, who is untouched by ignorance and its effects, he is freed from all fetters.

Yajur Veda, Svetasvatara Upanishad, Part I, Chapter II, 15

He indeed, the Lord, who pervades all regions, was the first to be born and it is He who dwells in the womb of the universe. It is He, again, who is born as a child and He will be born in the future, He stands behind all persons and His face is everywhere.

Yajur Veda, Svetasvatara Upanishad, Part I, Chapter II, 16

The Self-luminous Lord, who is fire, who is in water, who has entered into the whole world, who is in plants, who is in trees-to that Lord let there be adoration! Yea, let there be adoration!

Yajur Veda, Svetasvatara Upanishad, Part I, Chapter II, 17