I went to a “mindfulness” group at the psychological clinic here. I don’t know much about the topic yet, but it struck me that one definition would be using your own mind to your benefit rather than to your detriment. In other words, don’t outthink yourself. Notice the thoughts and emotions you are having and allow them to pass through you without overstaying their welcome. I’ve always thought the best way of dealing with negative emotions is to pay no attention to them at all and hope they would go away, but I’m open to new approaches.