Discern the real from the temporary.

This is among the most philosophically dense and significant verses in the Gita — a statement of ontological truth that underpins everything that follows. 'Asat' (unreal) and 'Sat' (real) are technical terms: the body and all phenomena are 'asat' — not permanent, not self-sustaining, changing constantly, and ultimately ceasing.

The soul is 'Sat' — real, self-sustaining, eternal, and incapable of non-existence. The verse declares: whatever is truly real cannot be destroyed; whatever can be destroyed was never ultimately real.

This is not nihilism but a precise hierarchy of reality. The temporary is not worthless — it is real at its own level — but it cannot bear the weight of ultimate meaning or ultimate fear. To mourn the death of a body as if permanent reality has been destroyed is to confuse these two levels. The 'tattva-darśibhiḥ' — the seers of truth — have internalized this distinction and live accordingly.

The practical import is vast. Much of human suffering arises from treating impermanent things — relationships, health, reputation, wealth — as if they were permanent, or from fearing that what is truly permanent (the soul, consciousness, being) could be extinguished. Right relationship to reality means grieving real losses at their appropriate level while remaining anchored to what is actually indestructible.

This is neither attachment nor detachment but clear seeing. As Shakespeare's Prospero says, 'We are such stuff as dreams are made on' — but the dreamer is real.