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

Kāthakopaniṣat Bhāshya (काठकोपनिषत् )

na sandṛśe tiṣṭhati rūpamasya na cakṣuṣā paśyati kaścid enam। hṛdā manīṣā manasā'bhiklṛpto ya enaṃ vidur amṛtās te bhavanti ॥9॥

The true form of this is not visible and cannot be seen with the eyes. It is understood by the heart, wisdom, and mind. Those who realize this truth become immortal.

Testimonial continues to elaborate - "Lord Vishnu is seen through the vision of knowledge alone, not by the corrupt senses."

"prādurbhāvānṛte viṣṇuṃ indriyaiḥ naiva paśyati। prādurbhāvānapi yadā jñānadṛṣṭyaiva paśyati। tadaiva mucyate yogī na duṣṭairindriyaiḥ kvacit॥"

"Unmanifest Lord Viṣṇu is not seen by the senses. Even with manifestation, when seen through the vision of knowledge, then only the yogi is liberated, not by any of the corrupted senses."

- stated thus, as well.

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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