What are the famous sad sentences in China's classical poems?

One kind of lovesickness, two places of leisure. There is no way to eliminate this situation, only frown and mind. -Li Qingzhao's "A Piece of Plum"

Indus is raining in Mao Mao, dripping at dusk. This time, what a sad sentence! -Li Qingzhao's Slow Voice

Cutting is still messy, which is parting from sorrow. It's not just the general taste. -Li Yu's "Hui Huan"

How much sadness can you have? It's just a river flowing eastward. -Li Yu's Young Beauty