Bhagavad Gita 2.16
नासतो विद्यते भावो नाभावो विद्यते सतः । उभयोरपि दृष्टोऽन्तस्त्वनयोस्तत्त्वदर्शिभिः ॥
nāsato vidyate bhāvo nābhāvo vidyate sataḥ | ubhayor api dṛṣṭo 'ntas tv anayos tattva-darśibhiḥ ||
Translation
There is no existence for the unreal, and no non-existence for the real. The truth about both has been seen by the seers of truth.
Reflection
What in your life has been ending lately that was never the actual thing?
Read this verse in its chapter: Chapter Two
A line a philosopher could spend a career on. Asat has no being. Sat has no non-being. Krishna offers the bare metaphysics: what does not exist cannot start, and what exists cannot end. Tattva-darśin, those who have seen the way things are, have settled this. The argument's force here is brisk; the verse does not stop to prove what it claims. It marks the floor for the next eight verses. Whatever in you is real cannot be killed. Whatever can be killed was not what was real about you. Arjuna's grief is grieving the wrong category.