What do you mean, "Blowing into yellow sand begins with gold and requires a lot of efforts"?

After thousands of times of filtration and hardships, we can finally wash out all the sediment and get glittering gold.

Zaqu Gezi Langtaosha

Author Liu Yuxi? the Tang Dynasty

Mo Tao's slanderers are as deep as waves, and Mo Yan's guests are as heavy as sand.

Although it is hard, it is difficult to blow out crazy sand when it is not golden.

Translation:

Don't say that slanders are like stormy waves, and don't say that people who have been demoted are buried underwater like mud. After thousands of times of filtration and hardships, we can finally wash out all the sediment and get glittering gold.

Extended data:

Creation background

Since the Anshi Rebellion in the Tang Dynasty, the momentum has declined. Governors are independent, eunuchs are authoritarian. When talented people are released and angered, resentful works are produced. After Liu Yuxi was transferred from Beijing official to local official, he also wrote famous works, such as Nine Poems of Langtaosha.

This group of poems should be Liu Yuxi's later works, not created at one time and one place. According to the Yellow River, Luoshui, Bianshui, Qinghuai, Nautilus Island, Zhuo Jinjiang, etc. Poems, or works for activities in Kuizhou, Hezhou and Luoyang, were later compiled into a group. Some scholars believe that this group of poems was written in the late Kuizhou period, that is, in the spring of the second year of Changqing (AD 822).

Baidu Encyclopedia-Nine Poems of Langtaosha