Bhagavad Gīta Bhāshya
B.G 2.68
तस्माद्यस्य महाबाहो निगृहीतानि सर्वशः। इंद्रियाणींद्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता ॥६८॥
tasmādyasya mahābāhō nigr̥hītāni sarvaśaḥ। iṁdriyāṇīṁdriyārthēbhyastasya prajñā pratiṣṭhitā ॥68॥
Therefore, O mighty-armed one, Those who have restrained in all respects their senses from the objects of senses, their wisdom is firmly established.
Gīta Bhāshya 2.68
One must try to control senses fully with the whole of his being.
Therefore, a person who tries to control the senses fully with all his being only becomes a Jnānin, the knowledgeable. Thus, control of senses is explained to be the primary reason in 'tasmāt' verse.

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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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