For for the born, death is certain, and for the dead, birth is certain. Therefore, regarding something unavoidable, you should not grieve

The cycle of saṃsāra is inescapable: jātasya mṛtyuḥ (for the born, death), mṛtasya janma (for the dead, birth). Dhruva (certain, firm) describes both as natural laws.

Aparihārya (that which cannot be avoided, evadable) — the artha (matter, situation, object) is the cycle itself. Grieving the inevitable is irrational; better to act with equanimity toward what cannot be changed.

The hi (certainly, for) connects with universal empirical evidence. All the born die; all the dead are reborn in some form.