Mundakōpanishad Bhāshya
Mundaka 4.03
That imperishable essence is Brahman, encompassing life-force, speech, and mind. It is immortal, the ultimate truth, something to be realized, the dear one.
Bhāshya 4.03
The Lord Viṣṇu is called the 'prāṇa', i.e. life-force, as he is the lord of the life-force, he is called 'vāk' i.e. speech, as he is expressed by speech, he is called 'mano' i.e. mind, as he is expressed through thoughts. Such Lord Vishnu is the controller of all living beings.
"The Lord Viṣṇu is called the 'prāṇa', i.e. life-force, as he is the lord of the life-force, he is called 'vāk' i.e. speech, as he is expressed by speech, he is called 'mano' i.e. mind, as he is expressed through toughts. Such Lord Vishnu is the controller of all living beings."
- stated thus in Shabdanirṇa, an ancient text on the decision of the word.

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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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