An example of this is Elvis Presley. He had many negative people come into his life. For instance, he once tried out for a local vocal quartet, and was rejected on the premise that he couldn't sing! He shortly tried out for another band and was told to stick to his truck driving career because he was never going to make it as a singer! Can you imagine if he had listened to those people? He may have given up altogether, and our world would have never heard his voice and been changed because of it.