What would someone do if their to do list was finished? Presumably a person always has more to do. And presumably people think of doing a lot more than they actually can do. Your reach should always exceed your grasp. (Or, less politely, when all is said and done, there is a lot more is said than done.)
You never finish a to-do list. They are endless. You will always have stuff to do, and it literally never ends. My solution is to be at peace with the fact that it's endless and I'll never be able to stop and say, "that's it, I've completed my to-do list."
