Bhagavad Gīta Bhāshya and Tātparya
B.G 8.11
That imperishable (reality) which the knowers of the Vedas declare, which the ascetics free from attachment enter, and which, desiring, they practice the discipline of 'brahmacharya' — I shall briefly declare to you the path to that supreme state.
Gīta Tātparya 8.11
'Brahmacharya' - disciplining the mind and faculties in Brahman.
Disciplining the mind and faculties in Brahman is Brahmacharya.

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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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