From the Bhagavad Gita:
The Blessed Lord said:
Addressing his son Suka,
Vyasa said: I shall now tell thee, how, when Brahma’s day is gone and his night comes, he withdraws all things unto himself, or how the Supreme Lord , making this gross universe exceedingly subtle, merges everything into His Soul. When the time comes for universal dissolution, a dozen Suns, and Agni (fire) with his seven flames, begin to burn. The whole universe, wrapped by those flames, begins to blaze forth in a vast conflagration. All things mobile and immobile that are on the earth first disappear and merge into the substance of which this planet is composed.
After all mobile and immobile objects have thus disappeared, the earth, shorn of trees and herbs, looks naked like a tortoise shell. Then water takes up the attributes of earth, viz., scent. When earth becomes shorn of its principal attributes, that element is on the eve of dissolution. Water then prevails. Surging into mighty billows and producing awful roars, only water fills this space and moves about or remains still. Then the attribute of water is taken by Heat, and losing its own attribute, water finds rest in that element. Dazzling flames of fire, ablaze all around, conceal the Sun that is in the centre of space. Indeed, then, space itself, full of those fiery flames, burns in a vast conflagration. Then Wind comes and takes the attribute, viz., form of Heat or Light, which thereupon becomes extinguished, yielding to Wind, which, possessed of great might, begins to be awfully agitated.
The Wind, obtaining its own attribute, viz., sound, begins to traverse upwards and transversely along all the ten points. Then Space takes the attribute, viz., sound of Wind, upon which the latter becomes extinguished and enters into a phase of existence resembling that of unheard or unuttered sound. Then Space is all that remains, that element whose attribute, viz., sound dwells in all the other elements, divested of the attributes of form, and taste, and touch and scent, and without shape of any kind, like sound in its unmanifest state of existence. Then sound, which is the attribute of space, is swallowed up by Mind which is the essence of all things that are manifest. Thus Mind which in itself is unmanifest withdraws all that is manifested by Mind. This withdrawal of Mind as displayed into Mind as undisplayed or subtle, is called the destruction of the vast external universe.
Then Chandrama’s having made Mind (thus) withdraws its attribute into itself, swallows it up. When Mind ceasing to exist, thus enters into Chandramas, the other attributes that are owned by Iswara are all that remain. This Chandramas, which is called also Sankalpa, (resolution) is then, after a very long time, brought under Iswara’s sway, then reason being that that Sankalapa has to perform a very difficult act, viz., the destruction of Chitta or the faculties that are employed in the process called judgment. When this has been effected, the condition reached is said to be of high knowledge.
Then Time swallows up this Knowledge, and as the Sruti (Vedas) declares, Time itself, in its turn, is swallowed up by Might, or Energy. Might or Energy, however, is (again) swallowed up by Time, which last is then brought under her sway by Vidya. Possessed of Vidya, Iswara then swallows up non-existence itself into his Soul. That is Unmanifest and Supreme Brahma. That is Eternal, and that is the Highest of the High. Thus all existent creatures are withdrawn into Brahma. Truly, hath this, which should be conceived (with the aid of the scriptures) and which is a topic of Science, been thus declared by Yogis possessed of Supreme Souls, after actual experience. Even thus doth the Unmanifest Brahma repeatedly undergo the process of Elaboration and Withdrawal (i.e., Creation and Destruction), and even thus Brahma’s Day and Night each consist of a thousand Yugas. (See Cosmic Time Scale, Page 'Creation' in the column at the left ’).
[Note: The above verses use technical terms of Yoga such as Chandramas,
Kala, Valam, Akasa, Ghosa etc. and refer to things beyond the reach of
ordinary experience and intelligence. Yoga mystery is here expanded, which
in some instances,Yogis alone can