Begin to write on a sheet of paper "I remember..." and then see what comes next. Surprisingly often, what comes are memories that haven't been looked at for years, and they frequently carry central issues from your life. Meditation is also a work-through of memories.
We all carry an image of our friends in our minds. When we have regular contact with those friends, the image constantly grows and changes over time as a result of our interactions with them. When the friend is no more, what happens to this image?