Bhagavad Gīta Bhāshya and Tātparya
B.G 2.27
Death is inevitable for one who is born and birth is inevitable for one who dies. Therefore, you should not grieve over what is unavoidable.
Gīta Bhāshya 2.27
Don't grieve over what is unavoidable.
Why one should not grieve? Because it is inevitable, so said in 'jātasyeti' 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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