Kāthakopaniṣat Bhāshya (काठकोपनिषत् )
2.3.15
yadā sarve prabhidyante hṛdayasyeha granthayaḥ। atha martyo'mṛto bhavati etāvadanuśāsanam ॥15॥
When all the knots of the heart are broken, the mortal becomes immortal; this is the essence of the teaching.
Bhāṣya 2.3.15
'Knots of the heart' are nothing but the knots of false knowledge.
mithyājñānagranthibhistu nitarāṃ mucyate yadā। tadāmṛtatvamevaiti tadarthaṃ cānuśāsanam ॥15॥
When one is completely released from the knots of false knowledge, then indeed one attains immortality; for that purpose is the instruction.

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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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