出淤泥而不染

Explanation: Sludge: the underwater sludge; dye: James. Growth in the mire, without being polluted by sewage sludge 　　Usage: Complex sentence; as attribute, object, clause; metaphor character in the polluted environment, to maintain purity 　　Source: London Song Zhu Yi "Reminiscence": "to separate the lightness finds Eleonora, Zhuo Qing even without demon." Thesaurus:  be soaked in a dark liquid without becoming back, Without sediment mud