Sayings. My mother loved sayings. She got most of them from her mother, who loved sayings too. “Who knows what it’s good for” was one of her favorites. When I was younger I didn’t understand most of them. Now that I’m older, I’m slowly but surely turning into an idiom connoisseur, just like my grandmother used to be. “Who knows what it’s good for.” I understand it now. I know what it means , or at…