My very wise father always taught me everywhere I went to leave a positive mark. Pick up clothes that had fallen off a hanger in a clothing store. Smile to anyone who catches your eye. Compliment people whenever there is an opportunity to sincerely do so. Listen, and really hear, people. Everyone has value. And he was a perfect example, living them as well. A few seconds out of his day to make a difference was worth every one of those seconds and never an inconvenience.