Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
1.2.12
The steadfast one, having known that divine being — who is difficult to see, hidden, entered within, placed in the cave, abiding within the liberated beings, ancient — through the yoga of the adhyātma, i.e. Yoga regarding the supreme essence, gives up joy and sorrow.
Bhāṣya 1.2.12
'gahvare' - situated within the liberated beings.
The word 'gahvare', i.e. entering into depths, implies situated within the liberated beings.

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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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