Madhvacharya's Dvaita Vedanta and translation of Sarvamoola containing Bhagavad Gita, Upanishads, and Brahmasutra.

Kāthakopaniṣat Bhāshya (काठकोपनिषत् )

1.1.13

प्र ते ब्रवीमि तदु मे निबोध स्वर्ग्यमग्निं नचिकेतः प्रजानन्। अनन्तलोकाप्तिमथो प्रतिष्ठां विद्धि त्वमेतं निहितं गुहायाम् ॥१३॥

To you I declare—do learn this from me, O Naciketas, the heavenly fire, understanding which one attains infinite worlds and the firm foundation. Know this, placed within the secret cave (of the heart).

Bhāṣy 1.1.13

It is lord Vishnu, the foundation of all worlds, who dwells in all hearts.

"लोको विष्णोरनन्तस्य तज्ज्ञानान्नित्य आप्यते। प्रतिष्ठा सर्वलोकस्य स विष्णुः सर्वहृद्गतः॥"

"The world of the infinite Viṣṇu is eternally attained by the knowledge of him. He, Viṣṇu, the foundation of all worlds, dwells in all hearts."

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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