'Svetasvatara Upanishad '...

Svetasvatara Upanishad - Chapter 4
The One God of the Manifold World

As explained by T.N.Sethumadhavan:
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The world was inactive and unmanifest before creation. The Paramatman in His formless aspect is devoid of form and color, yet, in the beginning of creation for some unknown reasons assumes various forms and colors through His various powers (of maya) which are non-different from Him.
In the end, this universe of all forms and colors merge in Him. He initiates this cycle of creation, maintenance and dissolution without any selfish purpose but for the ultimate good of the Jivas (agrhita prayojanah, svaartha nirapekshah).

That Supreme Lord is really one without the second. Apart from Him, there is nothing. May that Lord of self-luminosity, bestow auspicious intellect upon us?

The purpose of creation is stated to be hidden, meaning that we, the finite, cannot
understand the reasons behind the creation by The Lord, The Infinite. It is His Lila.
In the above Mantra, Brahman is described as One in whom both the beginning and the end find their abode.

Sri Krishna says in the Bhagavad Gita :
avyaktaadeeni bhootani vyaktamadhyaani bhaarata
avyakta nidhanaanyeva tatra kaa paridevanaa // 2.28 //

Beings are unmanifest in their beginning, manifest in their middle state and unmanifest again in their end O, Arjuna. What is there to grieve about?

The gist of this Mantra is that the beginning and the end is unmanifest and only the middle state represents the manifest.
The basic nature of things is the Unmanifest and the manifest is only a condition which appears for the time being in between the two states of the unmanifest.
The grace and modesty of the manifest lies in not clinging to its existence and where it makes no effort to prolong its continuity. The manifest is only a passage from the unmanifest to the unmanifest.. In the passage one must move on and not settle down.

Life is a bridge, pass over it, but do not build upon it.

The inspiring teaching of this Upanishad is “The beginning and the end reside in Brahman, the world is only a
passing phase of the Manifest”.