不言而谕

Explanation: Introduction: explanation. Needless to say, can understand. Described the affair is obvious 　　Usage: Partial official; as the predicate attribute; that common sense is very clear 　　Source: Su Song, "but mouse knife Ming": "Ah sigh husband, I have the Gou, without saying that the encyclical is the Yi He labor." Thesaurus:  need not tautology