Some time ago I heard an 82-year-old lady talk about how her parents' marriage had been a happy one. She said that the whole time she was growing up, her mother

Some time ago I heard an 82-year-old lady talk about how her parents' marriage had been a happy one. She said that the whole time she was growing up, her mother kept a newspaper clipping on the family icebox that described marriage as a process by which "two stones are by friction made smooth". It was only later that she saw this as a sign that her parents did have their difficulties, and that her mother must have kept it there as a reminder. The point is, these insights are proverbial.