You cannot change the nature of things. The most important difference between man and animal is that man can strive to change his natural inclinations through commitment, assisted by divine grace. A cat who knows only but steal food from your table seldom change no matter what punishment you bring into it. But a wayward person can change the course of his life if he realized he followed the wrong path, and seek God's graces for the change. Beyond that the nature of things stay the way they are.