“You know, Howie had been in speech therapy. He’d just got over this massive stammer. What an achievement. I mean, can you imagine? I’d forgotten not all victories are about saving the universe.”
-Rory Williams
Doctor Who
Series 6, Episode 11, “The God Complex”

It’s such a small thing, to improve just one little part of yourself. Yet it’s not “small” at all. It really is a grand accomplishment, and a worthy pursuit. Not all heroes save everything. Not all heroes fight enemies or have even saved one life (yet). But all heroes do strive to become better, and just a little bit more than they were before, day by day by day. Heroes strive to improve the world by improving themselves.