The realisation of one's identity with Brahman is the cause of Liberation from the bonds of Samsara, by means of which the wise man attains Brahman, the One without a second, the Bliss Absolute.
Once having realised Brahman, one no longer returns to the realm of transmigration. Therefore one must fully realise one's identity with Brahman.
Brahman is Existence, Knowledge, Infinity, pure, supreme, self-existent, eternal and indivisible Bliss, not different (in reality) from the individual soul, and devoid of interior or exterior. It is (ever) triumphant.
It is this Supreme Oneness which alone is real, since there is nothing else but the Self. Verily, there remains no other independent entity in the state of realisation of the highest Truth.
All this universe which through ignorance appears as of diverse forms, is nothing else but Brahman which is absolutely free from all the limitations of human thought.
A jar, though a modification of clay, is not different from it; everywhere the jar is essentially the same as the clay.
Why then call it a jar ?
It is fictitious, a fancied name merely.
None can demonstrate that the essence of a jar is something other than the clay (of which it is made). Hence the jar is merely imagined (as separate) through delusion, and the component clay alone is the abiding reality in respect of it.
Similarly, the whole universe, being the effect of the real Brahman, is in reality nothing but Brahman. Its essence is That, and it does not exist apart from It. He who says it does is still under delusion - he babbles like one asleep.
This universe is verily Brahman - such is the august pronouncement of the Atharva Veda. Therefore this universe is nothing but Brahman, for that which is superimposed (on something) has no separate existence from its substratum.
If the universe, as it is, be real, there would be no cessation of the dualistic element, the scriptures would be falsified, and the Lord Himself would be guilty of an untruth. None of these three is considered either desirable or wholesome by the noble-minded.
The Lord, who knows the secret of all things has supported this view in the words: "But I am not in them" "nor are the beings in Me".
If the universe be true, let it then be perceived in the state of deep sleep also. As it is not at all perceived, it must be unreal and false, like dreams.
Therefore the universe does not exist apart from the Supreme Self; and the perception of its separateness is false like the qualities (of blueness etc., in the sky).
Has a superimposed attribute any meaning apart from its substratum ?
It is the substratum which appears like that through delusion.
Whatever a deluded man perceives through mistake, is Brahman and Brahman alone: The silver is nothing but the mother-of-pearl. It is Brahman which is always considered as this universe, whereas that which is superimposed on the Brahman, viz. the universe, is merely a name.
Hence whatever is manifested, viz. this universe, is the Supreme Brahman Itself, the Real, the One without a second, pure, the Essence of Knowledge, taintless, serene, devoid of beginning and end, beyond activity, the Essence of Bliss Absolute - transcending all the diversities created by Maya or Nescience, eternal, ever beyond the reach of pain, indivisible, immeasurable, formless, undifferentiated, nameless, immutable, self-luminous.