This is a sentence from Cao Zhi's "Seven Steps of Poetry":
Boil the beans to make soup, and drain the black beans to make juice.
The leaves are falling to the cauldron, and the beans are weeping in the cauldron.
They are born from the same roots, so there is no need to rush into conflict.
According to "Shishuoxinyu.Literature", after Cao Pi became emperor, he always resented his talented younger brother Cao Zhi. Once, he ordered Cao Zhi to compose a poem within seven steps. First, if he couldn't do it, he would be executed. However, before Cao Zhi could finish his words, he responded with six lines of poetry, which is the popular poem above. Because it can only be composed in seven steps, later generations called it the "Seven-Step Poetry". It is said that Cao Pi was "deeply ashamed" after hearing this. Not only was Cao Zhi's extraordinary talent reflected in his poems and his ability to formulate sentences, which made Emperor Wen feel inferior, but also because the poem used simple and vivid metaphors to illustrate that brothers are brothers and should not be separated from each other. They were suspicious and resentful of each other, and showed great righteousness, which naturally made Emperor Wen ashamed.