So let me say here, if I didn't love what I do, I wouldn't do it. I'd be in my back up career by this point. Many people who started out wanting to be teachers are by now, which implies to me that the ones who stick around love what they do.
Which leaves us with Matt Damon, who while speaking at a rally for teachers in Washington, was aggressively questioned by an interviewer and a cameraman as to why he would stand up for a group that "doesn't have incentive to work". Matt does his teachers proud by destroying both their arguments.
Not safe for work, as Damon uses some choice language to get his point across.