From Bai Juyi's (
白居易) Tang poem 《
赋得古原草送别》 (Farewell on the Ancient Plain, Composed on the Grass). The famous couplet reads:
野火烧不尽,
春风吹又生 — 'Wildfire cannot burn it all; when spring winds blow, it grows again.' Reportedly written by Bai Juyi at 16 as an examination-piece for entering the capital. The image of indestructible grass became the enduring Chinese metaphor for resilience.