I am the father of this universe – the mother, the sustainer, the grandfather, the purifier, the knowable, the sacred mono-syllable OM and also the Rig, Sama and the Yajur Vedas.
In order to show that the Self permeates everywhere The Lord says that He is the father, the mother, the sustainer, the grandfather and the purifier of the worlds. He is the one thing to be known because the Self is that which having known, everything becomes known. The Self, the substratum of the entire living universe, is symbolized by the Vedic mantra called OM. Life, which is the flow of constant experiences, implies the sum-total of all experiences in each one of us during the waking, dreaming and deep-sleep states.

The substratum for these three states and their experiences must be something other than the super-impositions on it just as the container is different from the contained. The fourth state supporting the ordinary states of consciousness in every one of us is termed Turiya. The sacred symbol OM represents all these four states. Therefore the Ultimate indicated by OM is the Self. This Absolute Reality is the theme of all the Vedas and therefore it is said that ` I am also the Rik, Sama and Yajus.

The commentary on this verse and the rest, is avaialble for free as:
Kindle eBook
Google Play Book
Apple Books

Asya, of this; jagatah, world; aham, I; am pita, the father; mata, the mother; dhata, ordainer, dispenser of the results of their actions to the creatures; (and the) pirtamahah, grand-father. I am the vedayam, knowable-that which has to be known; the pavitram, sanctifier; [Virtuous actions.] and the onkarah, syllable Om; eva ca, as also Rk, Sama and Yajus. [Brahman, which has to be known, is realizable through Om, regarding which fact the three Vedas are the authority. The ca (as also) is suggestive of the Atharva-veda.]Moreover,