अणोरणीयानहमेव तद्वन्महानहं विश्वमहं विचित्रम् ।
पुरातनोऽहं पुरुषोऽहमीशो हिरण्मयोऽहं शिवरूपमस्मि ॥ २०॥
पुरातनोऽहं पुरुषोऽहमीशो हिरण्मयोऽहं शिवरूपमस्मि ॥ २०॥
aṇoraṇīyānahameva tadvanmahānahaṃ viśvamahaṃ vicitram .
purātano’haṃ puruṣo’hamīśo hiraṇmayo’haṃ śivarūpamasmi .. 20..
purātano’haṃ puruṣo’hamīśo hiraṇmayo’haṃ śivarūpamasmi .. 20..
20. I am smaller than the smallest and also am I the most vast. I am the manifold universe – amazing; I am the ancient one, the Puruṣa; the supreme Ruler am I, the effulgent one, by nature ever auspicious.
Word Meaning
अणोः – than atom, smallest particle; अणीयान् – smaller; अहम् – I; एव – alone; तद्वत् – similarly; महान् – great; अहं – I; विश्वम् – universe; अहं – I; विचित्रम् – amazing; पुरातनः – ancient; अहं – I; पुरुषः – Puruṣa, the soul; अहम् – I; ईशः – Ruler; हिरण्यमयः – effulgent; अहं – I; शिवरूपम् – form of auspiciousness; अस्मि – am
Kaivalya Upanishad Introduction
Kaivalya Upanishad Invocation
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Kaivalya-20
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Kaivalya Upanishad – Verse 20 – Kaivalya Upanishad 20 – In Sanskrit with English Transliteration, Meaning, Audio and Commentary – Kaivalya-20

The meaning here is that the Absolute is beyond measure. Because the Absolute Alone “is” existence there is not that other to be greater or smaller. Further, being the entirety of Existence the Absolute is without exterior or interior.
“I am the manifold universe. I am the Ancient One, the Consciousness and the Ruler”.
It has been explained before that the Absolute is the Universe and all things and being the eternal Primal unity of Existence it is the Ancient One. Further, there exists nothing older nor does there exist anything younger than the Absolute.
“I am the Effulgent One, and the All-good”
Being the source of knowledge of all things the Absolute is the light of all existence. All conforms perfectly to the one source of knowledge and is therefore all-good.
The meaning here is that because you are the Solitary totality of this very Existence you are all labels or all descriptions because you are all there is. Being this totally adequate completeness Alone it is your Solitary Responsibility to Realise the Truth of This to put an end to the Creation of untruth.