Bhagavad Gita 2.17 · Krishna
What fills everything cannot be destroyed
अविनाशि तु तद्विद्धि येन सर्वमिदं ततम्।
विनाशमव्ययस्यास्य न कश्चित्कर्तुमर्हति॥
avināśi tu tadviddhi yena sarvamidaṃ tatamvināśamavyayasyāsya na kaścitkartumarhati
Know that what pervades all of this is indestructible. No one can destroy the imperishable.
What it means
Krishna points to something present everywhere, the consciousness that pervades all things. It is avinashi, beyond destruction. You can't wound it, defeat it or end it. Not in yourself, not in anyone. This is the ground the rest of the Gita will build on.
The story
Arjuna fears destroying what he loves. Krishna answers that the deepest part of every person on this field is beyond anyone's reach, even his. It's a radical comfort. And it will shift the question from what might be destroyed to what must be done.
In your life
Think of someone who survived a painful childhood and still grew into a kind adult. Something in them stayed whole. When life feels crushing, remember there's a part of you no one can touch.
Something in you cannot be broken.