“When I say that grief is a kind of learning, I don’t mean learning something easy. This is not like mastering a specific skill such as riding a bike, learning how to keep our balance and how to use the brakes. This type of learning is like traveling to an alien planet and learning that the air cannot be breathed, and therefore you need to remember to wear oxygen all the time. Or that the day has thirty-two hours, even though your body continues operating as though it has twenty-four. Grief changes the rules of the game, rules that you thought you knew and had been using until this point.”