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

Bhagavad Gīta Bhāshya and Tātparya

Having restrained all the gates, fixing the mind in the lord Nārāyaṇa, placing the breath in the head, one remains established in the practice of yoga.

Whoever, uttering the one-syllabled Om, which is Brahman, and remembering Me, departs leaving the body, attains the supreme destination.

Gīta Tātparya 8.12 and 13

'ekākṣaram' - the Supreme Brahman.

Since the Supreme Brahman is conveyed by the single syllable (Oṁ), he is called 'ekākṣaram', i.e. single syllable.

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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