It is okay to have a mission and/or vision statement that you and your organization never quite fulfill?
In fact, part of the excitement of a mission (or vision, depending on your perspective of how one uses them) is that they are just outside one’s grasp… and will stay that way.
Semantics aside, I think it’s okay to have incomplete missions. It means that you’ve stretched yourself and your team to do impossible tasks.
In some ways, if you’re able to achieve and make all your marks all the time then you’re probably not making your goals very difficult.
Go ahead and shoot for the moon once in a while.