《淮南子·说林训》
总想太阳月亮永远光明，但浮云就是遮盖它们的光；总希望兰芝四季生长，但秋风就是使它们枯萎。
日月欲明而浮云盖之，兰芝欲修而秋风败之。
People always hope that the sun and the moon will shine forever, but floating clouds will cover their light; people always hope that orchids will grow in all four seasons, but the autumn wind will make them wither.