What ancient poem does a tree blossom and a tree fall from?

Interpretation: I saw a tree full of red flowers in the morning, and when I saw it at night, the flowers on the tree had withered. Flowers bloom and fall, flowers bloom and fall are impermanent, and so is life and death.

Origin: This poem is from the collection of poems of Su Huanjen, a Zen master of Longya in Tang Dynasty. It means that nothing in the world is constant, and everything exists by karma. Fate comes and goes, and we need to cherish each other.

The author introduces:

Zen master Longya was a monk in the Tang Dynasty. Fuzhou (Jiangxi) people, the common surname Guo. The world says that Long Yaju is a monk. Fourteen years old, he became a monk in Mantian Temple in Jizhou (Jiangxi). After Song Yue was appointed as a priest, he traveled a lot. I didn't learn when I first visited Cuiwei, thanks to Yi Xuan, and then I visited Deshan. Later, I paid a good tribute to Dongshan and inherited its law. Later, he was invited by the abbot of Miaoji Temple in Ma Shi and Longyashan, Hunan Province. Not a' master of the air'. Five generations later, Liang Long died for three years and lived to be eighty-nine.