There was a guy in the neighborhood I hung with during high school. He was light hearted, care free, joking all the time.I had heard that he was now completely the opposite. Bitter seeming, hard, not a bit of cheer in him.I met him again at a class reunion and found that the change was true. I had known that he had become a detective for the local police force and attributed the change to his line of work. I now can see how it would be worse than I imagined. Dealing with and understanding the motivations shown above day in and day out would drain the warmth out of anyone.