"Jyothi" therefore, conveys, "Brahman" as its meaning. When Brahman is imagined as having four 'feet', or quarters, all that is projected from Brahman comprises but one quarter. The Upanishads assert that the other three are "amritham", ("undying, undiminishable, changeless") in 'divi' (Divine Light).

A point to be remembered is that such amritham cannot be equated with the common light we deal with. The Upanishadic Jyothi is said to 'deepyathi' (illumine). How can this process be limited and tied down to the effect of ordinary worldly light? Jyothi is embodied in Brahman; it operates in and through Brahman only. Brahman is immanent in all and so, Jyothi reveals all and shines in all.

The base, the root, the cover of the ever-vibrating, ever-moving Cosmos is Brahman, the stable, the fixed, the immovable, the ever-steady Jyothi. When Brahman too starts vibrating, changing and moving, what happens is total mergence, submergence, Pralaya. For example, when the train moves, if the rails on which it moves, also move along, what about the fate of the passengers? When we walk, the road is stationary. So we are able to proceed safely along.

The light that shines individually is called the flame in the lamp; the light that illumines and reveals all is called Jyothi. This Jyothi brings to light the fire that pervades the regions, that warms the body and resides in the stomach, the gleam in the eye. The moon is lit by the sun and thereby made bright. All these activities are prompted and promoted by Brahman, which is Jyothi itself. Jyothi is the principle, the phenomenon of Illumination in all its aspects.