I wish I could be this stoic

I always loved this recurring line from the movie Bridge of Spies:

This is a question I always try to ask myself when I'm in a troubling situation. I may be inclined to fret, but what good would it do? I know it's easier said than done not to show any distress one might be feeling, but it's something I at least try to consider. Even if it's one such situation where it might be completely validated.