There’s a common belief that suffering is necessary for pleasure, or that evil is necessary for good, like the change of the seasons. It’s one of those ideas that sounds like wisdom, but when you think about it, it’s not actually true. There are some people who are happy all the time, and other people who are miserable all the time. I think suffering and evil are like taking a wrong turn on a journey. Taking a wrong turn sometimes happens, and some good can come of it. But it’s never necessary.