Closing couplet of Li Shangyin's (
李商隐, Late Tang) 《
锦瑟》:
此情可待成追忆,
只是当时已惘然。(Could this feeling have waited to become a memory? — at the time it was already lost in haze.) The poem, famous for its obscure imagery of a zither, butterflies, and pearls weeping under moonlight, is widely read as a lament for vanished love or lost ideals.