The loadstar of a saint is God Himself, not estimated usefulness. It is the work that God does through us that count, not what we do for him.
Like when you scrape your knee and you get a scar, but then the scar fades so much that no one can see it but you. But you know where it is. Cuz you remember what caused it. And no matter how hard you try, you can never forget how bad it hurt when it first happened.