Great article:

“Most of us go through life seeing the glass as half empty rather than half full. If I asked you to list your problems, it would probably be easy for you. If I asked you to list all the things that were good, that were working, your list would probably be much shorter and more difficult to produce. It’s not that there aren’t many good things in our lives. It’s that we tend to focus on the negative, on the cup being half empty, rather than half full.”