From Yuan Zhen's 《
遣悲怀》 (Tang dynasty), the second of three poems mourning his late wife Wei Cong:
诚知此恨人人有，
贫贱夫妻百事哀。 Yuan Zhen and Wei Cong had lived in poverty; she died before he became successful. The line's poignancy comes from his belated prosperity — the things he couldn't give her when it mattered.
