Even heavens come and go

ābrahmabhuvanāllokāḥ punarāvartino’arjunamāmupetya tu kaunteya punarjanma na vidyate

From Brahma's realm down, all worlds come back again, Arjuna. But one who reaches Me, son of Kunti, is not reborn.

What it means

Krishna gives a cosmic view. Even the highest heavenly realm, the world of Brahma the creator, is temporary. Everything there eventually returns to the cycle. Only reaching Krishna himself, the source, ends the round of birth and death. Every reward except the giver is passing.

The story

Arjuna had heard that a warrior's death brings heaven. Krishna puts that in perspective. Heaven is lovely, but it too ends. He's offering Arjuna something greater than any heaven.

In your life

Think of someone who reaches the top of their career, then finds even that peak gives way to new worries. Don't build your whole life on any single summit. Seek what lasts.