Ever been there? I have. You probably have too.
Yes, there are times when working harder is exactly what we need to do. If it were easy, anybody could do it, and probably already would have! Almost nothing important or valuable comes without more-than-average effort.
But for people with Type-A personalities like me, the more common problem is working too hard at something, rather than not working at all. And that can end up making all our effort nearly useless.