It is from Miscellaneous Songs: Langtaosha, which is one of the words created by Liu Yuxi, a poet in the Tang Dynasty.
Langtaosha was originally a folk song theme in the Six Dynasties, but it became the music of Jiao Fang in the Tang Dynasty. Based on this, Liu Yuxi created a series of poems called Langtaosha, with seven quatrains in a single poem.
Although it is hard, it is difficult to blow out crazy sand when it is not golden.
After thousands of times of filtration and hardships, we can finally wash out all the sediment and get glittering gold.
Poetry analysis
Although it is hard to wash for thousands of times, you will find real gold only by blowing out the sediment. In the author's poem, the metaphor of an innocent and upright person is that although he was framed by a villain for a while, his value will eventually be discovered.
"Although it is difficult, it is difficult to blow up the yellow sand before it reaches the gold." The literal meaning of these two poems seems to be that people who write about gold panning have to go through "thousands of times" and filter out all the sediment before they can get gold, which is about the hardships of gold panning people.
However, in this poem, the poet tries to express his thoughts. Although the slanderers framed him, those innocent and upright loyal ministers suffered injustice, were dismissed from office, demoted, expelled from the court and relegated to other places, but they would not sink into reality and would not change their original intentions. After suffering, we still have to clear our grievances.
Just like gold panning, although it takes a lot of efforts, it will eventually blow out crazy sand, but gold will shine sooner or later. Later generations also often use these two sentences to compare heaven to reward diligence, and diligence can make up for it, so gold always shines.
Refer to the above content: Baidu Encyclopedia-Miscellaneous Songs Langtaosha