An Ass1, having put on the Lion's skin, roamed about in the forest, and amused himself by frightening all the foolish animals he met with in his wanderings. At last, meeting a Fox, he tried to frighten him also, but the Fox no sooner heard the sound of his voice, than he exclaimed: "I might possibly have been frightened myself, if I had not heard your bray2."
No disguise will hide one's true character.