Although it's hard, it's hard to blow out wild sand before it reaches gold.

Although washing and filtering for thousands of times is bitter and tiring, only by filtering out the sand can you get real gold. "Thousands of difficulties and dangers, gold begins with blowing out wild sand" comes from the eight waves of sand written by Liu Yuxi, a poet in the Tang Dynasty, which means that after thousands of times of filtration and hardships, the sand is finally washed out of real gold. This poem was written during Liu Yuxi's relegation. Through the image metaphor of Sha and Jin, it shows that although he was slandered and wronged, he still kept his fighting spirit and ambition unchanged, showed an optimistic and open-minded spirit, and reflected the poet's positive and optimistic attitude towards life. Liu Yuxi was a minister, writer and philosopher in the Tang Dynasty, and was known as a "poet". His main works include Wuyi Xiang, Liu Mengde's Collected Works and Liu Ke's Collected Works.