We are all here on this planet, as it were, as tourists. None of us can live here forever. The longest we might live is a hundred years. So while we are here we should try to have a good heart and to make something positive and useful of our lives. Whether we live just a few years or a whole century, it would be truly regrettable and sad if we were to spend that time aggravating the problems that afflict other people, animals, and the environment. The most important things is to be a good human being.