Poetry describing the change of regret

The earth endures, and the sky endures; One day both will end, and this endless sadness will last forever. -Bai Juyi's Song of Eternal Sorrow

At the gate of Yiyang, the grass grows and the warbler flies, and the water flows from east to west. Fragrant trees have no flowers, and birds are singing all the way to the spring mountain. Li Hua in the "Spring Tour Prosperity" in Tang Dynasty

On the fifteenth day of the first lunar month, the flower market is brightly lit. The moon rose to the willow tree, and he met me at dusk.

On the Lantern Festival on the fifteenth day of the first month of this year, the moonlight and lights are still the same as last year. I will never see my old friend last year again, and my tears are soaked through my clothes. Song Ouyang Xiu "Cha Sheng Zi Yuan Xi"