Bhagavad Gīta Bhāshya and Tātparya
B.G 4.15
एवं ज्ञात्वा कृतं कर्म पूर्वैरपि मुमुक्षुभिः। कुरु कर्मैव तस्मात्त्वं पूर्वैः पूर्वतरं कृतम् ॥१५॥
evaṁ jñātvā kr̥taṁ karma pūrvairapi mumukṣubhiḥ। kuru karmaiva tasmāttvaṁ pūrvaiḥ pūrvataraṁ kr̥tam ॥15॥
(Understanding Me) thus, knowing the actions done by previous seekers of liberation, you also perform such actions only, possessing the similar attitude as previously possessed by your ancestors.
Gīta Bhāshya 4.15
The know-how of how to get liberated already exists in the tradition. Just follow the conduct of your ancestors.
There already exists a traditional conduct that is aware of how to perform the actions, is conveyed by "evaṁ" verse. "pūrvataraṁ karma" means "possessing the similar attitude as previous ancestors".

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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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