Bhagavad Gita Verses on Time & Impermanence

जातस्य हि ध्रुवो मृत्युर्ध्रुवं जन्म मृतस्य च। तस्मादपरिहार्येऽर्थे न त्वं शोचितुमर्हसि॥

For the born, death is certain, and for the dead, birth is certain; therefore, you should not grieve over the inevitable.

अव्यक्तादीनि भूतानि व्यक्तमध्यानि भारत। अव्यक्तनिधनान्येव तत्र का परिदेवना॥

Beings are unmanifest in their beginning, manifest in their middle state, O Arjuna, and unmanifest again in their end. What is there to grieve about?

मामुपेत्य पुनर्जन्म दुःखालयमशाश्वतम्। नाप्नुवन्ति महात्मानः संसिद्धिं परमां गताः॥

Having attained Me, these great souls do not take birth again here—a place of pain and impermanence—but have reached the highest perfection of liberation.

श्री भगवानुवाच कालोऽस्मि लोकक्षयकृत्प्रवृद्धो लोकान्समाहर्तुमिह प्रवृत्तः। ऋतेऽपि त्वां न भविष्यन्ति सर्वे येऽवस्थिताः प्रत्यनीकेषु योधाः॥

The Blessed Lord said, "I am the full-grown, world-destroying Time, now engaged in destroying the worlds. Even without you, none of the warriors arrayed in the hostile armies will live."