What Does "Generosity" Really Mean?

Parashat T'rumah presumes that we can ask people to donate and they will freely, lovingly, and generously give of themselves. What is the nature of generosity? Why are some people natural givers, while others are takers? Rabbi Rick Jacobs, president of the Union for Reform Judaism,raises questions about philanthropy and ideas about giving not just money, but of ourselves, and whether we can teach that behavior to others.