源清流洁

Explanation: The source of clear water, downstream water is clear. People in high positions of the original analogy is good, the people in the following 也好. Also be used to cause and effect relationship between things. 　　Usage: Joint type; as object, attribute; metaphor causal correlation 　　Source: "Xunzi Jun Tao" clear the stream clean source, the source voiced the flow of turbidity. " 　　Examples: ~, The end of the Sheng Rong. ★ Han Ban "Surabaya Pavilion inscriptions"