Nature is born, character is built, and personality is developed. If nature is such, then it is not easy to change a person's nature. Neither can a dog be made into a horse nor can a cat be made into a cow. Sa'di says, "The kitten in the end proves to be a kitten. Even if it were kept on the queen's sofa, petted and kissed and loved and cared for, when the mouse came it would show that it was a cat."