Lesson 1 Bringing up painful incidents of the past that cannot be changed will cause suffering without being beneficial. Lesson 2 Needlessly saying things to cause someone worry is considered onaas devarim (Verbal abuse). For example, "what if" statements. Or telling a parent who is sending off theirkid out of town for yeshiva/seminary things like "oh you dont know what could happen over there, people can get involved in all sorts of things..."