I worry about small things. Children. Weeds. A crack in the plaster of the wall in my family room. The violet plant that is not thriving. The cross I bought at a most holy place, the Scottish island of Iona, while traveling with my son Rob and dearest friend Helen Russell, a small silver cross I had fingered so often in times of larger worries. I lost it three or four years ago while visiting that same son, but I still worry about that cross. Under what clump of dirt or behi