Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
1.2.16
एतद्ध्येवाक्षरं ब्रह्म एतद्ध्येवाक्षरं परम्। एतद्ध्येवाक्षरं ज्ञात्वा यो यदिच्छति तस्य तत् ॥१६॥
etaddhyevāksaraṁ brahma etaddhyevāksaraṁ param। etaddhyevāksaraṁ jñātvā yo yadicchati tasya tat॥16॥
[एतत्-हि-एव-अक्षरं (etat-hi-eva-akṣaraṁ) - this indeed syllable; ब्रह्म (brahma) - is Brahman; एतत्-हि-एव-अक्षरं (etat-hi-eva-akṣaraṁ) - this indeed syllable; परम् (param) - is supreme; एतत्-हि-एव-अक्षरं (etat-hi-eva-akṣaraṁ) - this indeed syllable; ज्ञात्वा (jñātvā) - having known; यः (yaḥ) - who; यत्-इच्छति (yat-icchati) - desires whatever; तस्य (tasya) - to him; तत् (tat) - that;]
This syllable "Om" is indeed Brahman; this syllable is indeed supreme. Knowing this syllable, whatever one desires — that is attained by him.

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बहुचित्रजगद्बहुधाकरणात् परशक्तिरनन्तगुणः परमः ।
सुखरूपममुष्य पदं परमं स्मरतस्तु भविष्यति तत्सततम् ॥
"The one who has created this variegated vast universe with varied forms has infinite power and is of infinite auspicious qualities. He certainly bestows the highest state of bliss to those who meditate on his ever happy essence." -Dwādasha stōtra 4.3

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