This is a sentence from Bai Juyi's Song of Eternal Sorrow. After the Anshi Rebellion, Emperor Xuanzong of Tang Dynasty recalled Yang Guifei's plot-it was already different between Yin and Yang at that time. The last two sentences are: earth forbearance, heaven forbearance; One day both will end, and this endless sadness will last forever.

Do you think such poems can be used in weddings?