an improvement over the last

"There's a constant pressure to adapt to changes. It can be a painful process. But, without it you'll find yourself moving backwards instead of forwards. We have to keep reinventing ourselves almost every minute because the world can change in an instant and there's no time for looking back. Sometimes the changes are forced on us, sometimes they happen by accident, and we make the most of them. We have to constantly come up with new ways to fix ourselves. So we change, we adapt, we create new versions of ourselves. We just need to be sure that this one is an improvement over the last."

Grey's Anatomy