Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
1.2.07
He is not attainable even for hearing by many; many though hearing do not know Him. Wondrous is the speaker of him, skillful the one who attains Him, wondrous the knower, taught by the skillful.

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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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