There are many similar sentences. Here are a few examples: It's hard to find water in the vast sea, but it's hard to find clouds in Mount Wu. This sentence came from the fourth of the five poems of separation by Yuan Zhen, a poet of the Tang Dynasty. If life is only like the first time, why is the autumn wind sad for the painted fan? This sentence came from the Qing Dynasty poet Li Qingzhao's Dream Order. The wind and waves will sometimes hang the clouds and sail across the sea. This sentence came from the Tang Dynasty poet Li Bai's "Difficult Road". The green mountains cannot hide it, after all, it flows eastward. This sentence came from the Tang Dynasty poet Wang Zhihuan's "Climbing the Stork Tower." Asking you how much sorrow you can have is like a river flowing eastward in spring. This sentence came from the Tang Dynasty poet Li Qingzhao's "Dreamlike Order." These sentences all have some similar theme, that is, life is short, cherish the people in front of you, pursue your ideals and goals, and finally achieve your goals without fear of difficulties and setbacks.