By analogy from snot locker (military terminology for the nose), the heart is a persons hurt locker. Its the place where things that happen stay with us. Luckily, we keep joy in same place.
And what about Sgt James in the movie? Well, hes whats right about humans in a place thats all wrong. Im not here to fill his shoes, he says, Im just gonna do my best. To paraphrase Jules Winnfield: Check out the big heart in Will. ...even if there was only one thing he was still able to love.