Annapurna Upanishad अन्नपूर्णा उपनिषद्

The Annapurna Upanishad (Sanskrit: अन्नपूर्णा उपनिषद्, IAST: Annapūrṇā Upaniṣad) is a Sanskrit text and one of the minor Upanishads of Hinduism. It is classified as a Samanya Upanishads and attached to the Atharvaveda.
The text consists of five chapters, with a cumulative total of 337 verses.
"Who am I? How did the universe come about? what is the meaning of birth, death and life? what is freedom and liberation?"
Self love
But the lover of the inner Self,
though operating through the organs of action,
is unaffected by joy and sorrow,
he is said to be in Samahita (harmony).
He who, as a matter of course and not through fear,
beholds all beings as one’s own Self,
and others’ possessions as clods of earth,
alone sees aright.
-Annapurna Upanishad
Inner peace
Though standing, walking, touching, smelling,
the liberated one, devoid of all clingings,
gets rid of servitude to desires and dualities;
he is at peace.
A shoreless ocean of excellences,
he crosses the sea of sufferings,
because he keeps to this vision,
even in the midst of vexed activities.
-Annapurna Upanishad
"I am self that is the spirit, I am all, all is me, Brahman is the world, the world is Brahman, I am neither the cause nor the effect, vast and never finite". He knows, "I am That"