What is the idiom at the beginning of Qing characters?

Clear water and turbid water flow together: Clear water and turbid water flow together in a channel. Describe beauty and ugliness, good and evil mixed, good and bad regardless.

Root cause: it is to fundamentally rectify and clean up and completely solve the problem.

Voiced rhyme: a metaphor for profound attainments in articles.

Night question: refers to staying up late at night and reflecting.

Xu Qingdong House: refers to the Moon Palace.

Fresh and elegant: beautiful and novel, unconventional.

Pure heart and little desire: just keep a pure heart and have little desire.

Abstinence: same as above.